I had a shim in my left cleat at one point.... one made by the former LBS and one made by DH (can't remember why I switched). It resulted in me not being able to clip in very easily. This was with my Sidis and now I have Shimano shoes. Anyway, the fitter is very knowledgable and knows about this. If he has to make a shim, that's OK, except I do have winter cycling shoes that I am more apt to be wearing at this time of year, though I wasn't on Sunday and Tuesday.
Rear end is fine today. Of course, it's a moot point. It looks like January outside right now.