Thanks for posting that I hadn't seen it before. Looks like it's not going to be perfect then, at least it's close enough.
I think the refresh rate shown in the RA video menu is the average rate of the current emulation, that's why the number stablises the longer the game has been running. Could be wrong though...
Questions about arcade game emulation support on the ARpiCADE (MAME, DAPHNE, Picodrive, etc...)