My imprecise results since the last payout...two different addresses used.
middlecoin = 0.005286 BTC/Mh/s (about 2.23 Mh/s)
useast = 0.005322 BTC/Mh/s (about 2.03 Mh/s)
I'll continue to monitor. Periodic checks throughout the day showed that both pools were mining the same network.
Ok, then the difference must be in the exchanging. Time to move my rigs over, with the "main" as my backup... The difference MH for MH is substantial from what I can see so far... at least 25% increase