BHUNP Breast Physics Won't Work - Weird Stretch Glitch

[BasementDweller1]

I installed BHUNP, XPMSE, Faster HDT, and the rest of the requirements. All of the other body physics seems to work just fine, but the breasts are incredibly wonky. They sort of slide back and forth when the PC or an NPC idles, and stretch out behind them or into themselves when ragdolled or in combat stances. I can't for the life of me figure out what is wrong. I've redownloaded requirements, fiddled with the BHUNP specs on install, rebuilt BUNP 3BBBA body adv, BHUNP 3BBBA SMP body, and BHUNP collisions countless times in Bodyslide, but still no dice.

 

Skyrim SE 1.5.97

 

[BasementDweller1]

For reference, this is what the glitch looks like. 

 

 

 

[traison]

Skeleton issue. You appear to have *some* version of XPMSE, but the plugin list is of no use here since the esp is not responsible for the skeleton. Make sure nothing overwrites XPMSE's skeleton files.