Sloped Minifig Leg 3817b is wrong

[Max Martin Richter]

Guys,

I know we have put a lot of effort into the new 3817b/3816b - Minifig Legs by obsoeting the old 3817/3816 but the new geometry with the sloped backside is clearly wrong:



Any ideas how to correct the part without the need to reverse the whole conversion?

w.

I have how to solve this. But was is the real issue, that the real part doesn't match the LDraw one? Actually it is the slope, that's easy to see.
Is it the pivot point which is slightly off?