Hey Dude

A word on the Sub D front, if you are working at a higher level of editing on your sub d then converting back, its always gonna do it, I would suggest putting your detail in at level 0 and even then fine tune it a SD level 0. By all means use a higher level of edits on the Sub d but I wouldn't recommend it until you are almost complete and are going to convert to a high poly level once its finished.

_J