Patched stock cargo bays behave badly (aerodynamics and/or mass issues) in planes.

[allista]

To document the issue. After installing Hanger, my entire crop of Mk3 SSTO's seem to have gained an immense amount of weight. Even empty a plane that used to launch 2 orange tanks to orbit easily, now can't break 350m/s. I don't see any additional drag trails, so I am assuming it is a weight issue, but I guess there could be a hidden drag component as well, I am not sure. 

Edit: FWIW I edited the hangar/MM/Squad.cfg file and removed everything below line 80, and the parts seem to have returned to normal. Obviously without the hangar capability. Just to confirm the issue is with the Hanger mod and not some weird conflict elsewhere.