I agree that they should boost damage, but not by a lot, maybe for some weapons, but generally 30% baseline boost would be enough for everything power related.
Remember that there will be equipment also for bionic damage and there are boosters, they cant boost baseline too high.
Going with Lance example from my Asari Adept:
Base damage is 320, after all upgrades that gives +105% and bonus from annihilation field to should deal 787 damage.
If we assume that Equipment slot will increase damage by 35% than the final damage is 921.
If we boost base damage by +30% than we final damage with equipment will be 1198, which is almost 2x more than we currently have.
My counting also takes combo damage modifier as biotic power modifier, because i do not know what the bonus from combo is, so the damage is probably even higher, closer to real 2x.
Additionally i think that booster bonuses should be multiplicative, not additive.
I still think Cobra is in 100% fine spot right now.
What i think they need to change is enemies damage or characters HP, how enemies tracking and how easy they can be staggered.
Currently Asari Adept loses almost 70% shield from ONE Raider in about 1.5 second, which is bonkers
Just watch this short video to see how annoying it is. Enemies do not lose track of you, they instantly fire and practically hit 100% of the shots in full movement, with their damage is just stupid. Asari here has 426 shield HP, thats +65% of base shield.
https://youtu.be/j8dAspPmZZ4
Just to be clear, those are simpliest enemies and you clearly see what they are doing due end of match highlight, in battle with a lot of them its just crazy.
Also who really thought that regenerating only to half health is good idea. I know that this was already in ME 3, but this is just stupid design, especially with so high damage, hit scan enemies. You are basically never above 50% after first round, unless you heal or are class that has higher threshold.