If I'm understanding correctly, you make your models elsewhere, then bring them into CC4, then to iClone for animation, and you're trying to export them again?
If so, I can't speak for anything to do with Maya, etc., but I would start
for sure using the Unreal presets for export from either iClone or CC4. If you want to be able to retarget them to other rigs, you can do that in Unreal (probably better than in CC4). I would use the standard CC bone naming, but I'd think that would be taken care of when you bring your model
into CC4. Once you get your model in CC then out again into Unreal, it's easier to rename and redo bones there, if necessary. (at least I think so).
Also you might test sending your animation and model separately to Unreal, i.e. don't bake, or check the box to create separate FBX files. That might help you narrow down the problem.
Hope that helps. If not post where the failure occurs or maybe screen record your process, and we'll see if we can't figure it out.
:-)
____________________________________________
Life-long learner and having waaaay too much fun with iClone! Youtube Channel: 3DChick
Book Covers: www.significantcover.com Largely Unfinished Fiction: www.nemontgomery.com