UPADATING ON THIS (ROCKWELL BOSS AFTER THE UPDATE)
we did gamma and alpha. Gamma we tried binging a Shinehorn and hovering in tek suits, but that made more balls spawn (apparently, idk if its really related to the amount of tames), but the balls DO STILL TARGET THE PLAYER, so don't go in counting on them not following you, bring a fabricated pistol or a assault rifle to shoot them. We tried gamma again just for testing and didn't bring any shoulder pets, that time almost no balls spawned, and we defeated it in less than 10 mins.
Alpha was a whole other story. Balls spawned like crazy! Even with no tames. So that was a big issue cause we had to stop shooting tentacles for a few second to shoot the balls coming for us. In the end we managed to finish with 3 SECOND LEFT LOL. Almost had a heart attack at the end.
So if you're trying to to this with few people id say at least 3 players. Or if you only have 2 like me, try with something that deals more damage like a good tek rifle (we went in with 297 shotguns).
Ive recorded most of the fight and ill leave the link here if anyones interested in watching it, pretty epic at the end lol.