Prints no longer stick after mmu2s upgrade  

Prints no longer stick after mmu2s upgrade

So we'll do a quick tl;dr:

-prusa slicer, standard pla .15mm quality settings, brand new prusament pla filament

-upgraded from mk3s (ran like a flawless top) -> mmu2s

-reduced ptfe tube drag as much as possible

-switched to steel hot end

-ran preflight calibration all over again

-(non-stop prints keep pulling off the bed mid print)

-made sure nothing is lower than the nozzle

-completely replace hot end assembly, swapped in steel nozzle, got a textured print bed

-re-ran pre-flight calibration

-still same issue

-Tried: decreasing slicer layer height, used the printer's tune flow rate up

I'm completely stumped... I have no clue what I can do at this point other than rip the mmu2s off the thing and go back to when it ran without issue. I'm open to any help, I can video tape the thing and link the video, try out any test print. For starters I have pictures of one of a dozen attempts at a benchy, started printing just fine if not a little bit of an elephants foot (should have helped bed adhesion), then I hear a pop 30 mins in and the thing is off the bed, I hit pause print and took the pictures. I can only find success stories and minor struggles with the mmu2s, what did I do wrong here? I can't even get a single filament print to work, let alone a multi-filament...help please!