Managed to find out a way to find Class S ships much more faster.
So i found a Class S some days ago but only had 13 slots, and in the latest patch they said exotic ships was displaying the wrong amount of slots so i decided to hunt the same exotic to see if had more slots, and managed to grab the same exotic 3 times, 15 slots, then 19 slots then 20 slots in about 1 hour.
So here's what i did:
1st i whent back to the solar system i knew where i got it the 1st time. Only 1 exotic ship model spawn in a certain solar system so i knew that solar system had the model i wanted.
Then i grabed a quest to deliver a package, to point me the location of a Trading Station, once there i placed a beacon on the trade station.
Now the way the game works is when u reach the Tradeing Station 6 to 8 random ships spanw near it and try to land on it. Going up to space and coming back respawn more 6-8 random ships, and can always be an exotic.
There was no need to land on the station just get close enough, press right to circle the targets to see if the exotic ship appear on ur radar, if not, just go up in space and go back again, repeat untill he finally spawns.