The turrets aren't the problem at all in this fight, it's the fact that even getting close to him now bounces you halfway across the arena. Was your intention to make royal jelly a gun boss? This is the worst idea I've ever seen.
Of course, if this was completely unintentional, I can understand that maybe his physics are screwed up. But this is just over the top.
How can you fight him if he constantly pushes you back AND heals? Is he a bomb boss now? Because guns sure as hell won't work because of all the little slimes blocking you. This really needs to be fixed.
I don't know, we killed him without a death in the whole group REALLY REALLY fast