I think something might be strange with the scoring too. Here are my stats:
UWorld= 69% (48 questions, random, timed, ~70% complete)
NBME 2 (2 months prior)= 216
NBME 4 (1 month prior)= 247
NBME 6 (1 week prior)= 244
Step 1(5/27, V2)= 232
It's obviously a fine score, but I was shocked that it was so much lower than my two prior practice tests. I'm normally a good test taker (scored a 36 on the MCAT). I walked out feeling like it was a fair test and felt the same way I did after I took the practice tests. My performance profile looked completely different than the ones on my practice tests too. It seriously looks like another person took that test.
I'm going to spend the $55. It may be extremely rare to have a score changed and I doubt they actually re-analyze the scoring with much effort or rigor, but I figure it's worth a try.
By the way, where/when did you guys take the test? I was on 5/27 in NYC. Maybe we can see if there's a trend for scores in a particular region.