I finally beat it. Finally. Fuck.
Since I first posted that bitch fest about how much difficulty I was having I'd called a friend to see what he did , read some of the replies here and hunkered down for a couple solid attempts that I reloaded again and again at various points during the stage.
I was completely oblivious to my supreme fatal error that would have lost me the stage every single time no matter what I did.
That single fatal error ?
Well as I mentioned I did the burn the sky or whatever , the option to blow up the orbital platform that houses all the zerg air units. So I had nydus worms to deal with.
The major flaw in my battle plan was to only bother killing off the nydus worms inside or nearby my base, in fact I was almost completely ignoring even some of those close ones. How did a fail to notice this? I'm unsure, but as the game tells you during loading screens , AI controlled nydus worms pump out more and more units of stronger varieties the longer you allow them to live. So imagine if you will 3 worms popping up on the other end of the map at the 50% charged mark that I ignore until the 90% point. They basically spew out 20 hydras and 2 ultras at that point .
So don't be a moron like I was, I was so hard pressed to defend the 2 chokepoints by continually pumping crap into each section that I ignored why so many units were bombarding me for so long.
I actually ended up watching someones youtube playthrough of the stage before it clicked that was the specific problem with whatever it was I was trying to accomplish.
So for those wondering, here is what I did to finally finish the stage off with no issues whatsoever, copied almost entirely from that youtube video.
1- I had 2Xscv instead of auto gas so you have to click 3 seperate groups of 3 scvs and get them mining gas from the 3 plants, there are also 2 groups of 6 for each mineral field. In my case I built an extra 4 scv's for each mineral field and then 4 "floaters"
2- while the first things going on I added tech reactors to the 3 unit producing structures.
3- while the first 2 are going on I made sure 1 maruader was in each of the bunkers at the 2 choke points, as well any floating marines are bunkered down.
4- by the time this is all done I can start phase 2, send 2 scv's to each chokepoint from those 4 floaters. At each choke point build 2 more bunkers close to the first 1, load the other 2 marauders, 1 in each on both choke points and fill these 6 total (3 on each side) bunkers with marines, then have the scvs wall off with 3 or 4 perdition turrets on the 2 entrances on the left and the 3 entrances on the right as well as the zerg dampener in my case, if you chose the mind control device then use it instead I suppose
5- at the same time have the factory build 8 seige tanks, send 4 into siege mode just behind the bunkers at each choke point.
6- as well, build an extra couple of battle cruisers and have them gaurd the artifact, followed by filling up the starports build que with banshees
7-at this point in time you are probably maxing out your supply, so in my case I had the orbital drop supply depot for instant building. Grab an scv from econ or even build 1 extra and have it make like 8 supply depots or however many it takes to get 200 supply. You'll need it
8-if you have any extra money at any time make sure to remember to research upgrades, I always go weapons then armor
9- keep atleast 1 scv floating around each chokepoint to have things repair
10- make sure to check the command center every minute to keep launching mules into the mineral fields, this stage gives you way more money then you can spend (on normal atlesat)
11- call down the mercenary banshees and make sure that you have atleast 8 total regular ones
12- somewhere in the middle of this you'll get the first nydus canal alert, use the banshee squad to kill any the seige tanks don't cook
13- build the battle cruiser squad up to 6 total and again, keep 'em gaurding the artefact
14- to prepare for the eventual overlord rush, if you don't simply want to use the nova storm, you will have to have had a single SCV, perhaps the same one that built yoru supply depots, go around and scatter 5-6 bunkers all over your base, keep even a single marine in each and you should be able to fight off the overlords.
15- finally dealing with kerrigan- wait until she's used the float kill move on somethign then have your battle cruisers mass yamato her, in my case the mess of seige tanks, bunkered units and perdition turrets got her 75% dead before a yamato blast even hit her, she sholdn't pose a threat if you followed the directions above
16- obviously very important but keep an eye on those choke points, any destroyed perdition turrets, bunkers or seige tanks need to be replaced asap, siege tanks especially, above I mention having atleast 4 on each side (which gives you 5 total with the 1 you start with) it works even better to have 6-8 at all times, but build things up evenly you can't overbuild in 1 area without suffering in others.
17- Last but not least , as I got ravens instead of science vessels and ravens are actually kind of shyite in single player, it's not a bad idea to float your banshee squad over an idling scv after each nydus strike to heal it up
18- as well, some final base defense stuff I did that probably wouldn't lose the match if you ignored it- that same scv that built all the supply depots and then nearly empty bunkers? have it go around and scatter 6-8 perdition turrets around your base near structures and while your at it , building a couple extra bunkers and perdition turrets on the artifact's plateau can't hurt either
So I basically just kept up with everything and it honestly never felt difficult doing the stage this way, to think , all this time I was just ignoring a basic issue in the level. Not killing the source of 80% of all the enemies on the map. Even the last % went well, I think 8 nydus worms pop up in your base at the same time, kerrigan shows up and all the purple zerg rush you all at the same time and the worms all died before spawning units, kerrigan was dead before she killed more then 1 turret and the purple all got killed.
I'm extremely content to be finished with this now.