Physics Breasts and Arms Falling Through Body

[repent-harlequin]

I'm having an issue where my character's breasts and arms (but not hands) are falling through the body, but only when an HDT-SMP hair is set.
Attached screen shot showing the issue.

If I switch to a static hair, the physics appears to be working normally.

The mod setup order is:

KS Hairdos - HDT SMP (Physics)
XP32 Maximum Skeleton Special Extended

HDT-SMP (Skinned Mesh Physics)

CBPC - CBP Physics with Collisions

SINful CBP

CBBE 3BBB

 

I'm not seeing any overwritten files, so I'm not sure what the conflict could be.
If I switch CBBE 3BBB to SMP mode, the breasts function as expected, but the forearms continue falling through.

I've tried reinstalling the relevant mods, and rebuilding the body.
Any insight would be greatly appreciated.
Thanks.

[repent-harlequin]

Mystery solved, I was building the wrong hair physics in bodyslide.