I looked hard at the designs of both and can see why the Higgins would wet the Crew down more.
It's a slight design difference but it makes the difference as you mention.
I would expect from just foreward of mid-ship and back would be a problem area.
I also did some exporting of crew bodies and AI Crew to see if scale was an issue as mentioned in the original PT Boat thread.
I found the scale a non-issue in that regard.
Scale matches so it most probably the animations available that will cause issues.
The deadline for a workable Unit that meets the basic demands is fast approaching.
Any help is most wanted!