Believe me... I've struggled a lot from pXent plugin as well as from OBB ellipsoid hull. None of them is suitable to get fully working, solid movement out of the box. CCT has a lot of problems (even capsule shape) and limitations (unregistered and registering it back each time when you crawl/change position directly, also the lower half sphere shape of the capsule get's stuck while jumping and walking towards the low walls, box shape just get's simply stuck on every edge). OBB uses that ellipsoid thing, which requires some workarounds to get more or less good results. There is only one way out of this, making your own physX plugin, and not with 2.x SDK as the one that Acknex uses right now, but newer one, 3.x SKD! 3dgs_snake made a plugin, it had some bugs so he decided to make a new one from scratch with all things he has learnt from previous experience, but unfortunately it's development was held.

I could help you out with making movement code for your needs (as I have a lot of experience with it), but I would like to ask you for some shader help as well Let's call it barter!

Best regards!