JCMs for those type of rotation combinations in the thigh are tricky because something that might look right at one degree combination won't look quite right at a different combination. The only solution I've found for this are either multi axis JCMs which can only be done by value operations, or additional JCMs that kick in over top at degrees far into the rotation at a specific point. That is, starting not from zero but already into the rotation. It's a balancing act. Probably waaay too OCD for regular use cases.