the problem is SuperNOVA's scoring system has yet to be properly implemented (although the idea of setting the score system by the theme has been suggested. I -just- bumped the thread, so we may get some more opinions on it now)
SuperNOVA caps out on every song at 10,000,000; with a AA at 9,500,000 and no end-of-song bonus.
DDRMAXUS caps out at 5,000,000 (at least, that's what my Single-Great runs suggest), and I forget exactly how the other post-MAXUS USCS systems work as far as where the cutoffs and caps are.
this is what was suggested on the official SM boards.