I did include in my calculation the reject rate I got here and what I usually get on other pools (in CM and SG I get 5%~ reject with -i 18, 3%~ on hashcows and MC and 0-0.3% on Waffle).
Thanks for the info. I get similar reject rates that you report on waffle.
It's interesting to see all the new multi-scrypt coin pool popping up. So far I can't see any clear reason to choose one over another. The margins are all pretty close and fluctuate by what appears to be luck mixed in with some trading luck/timing as well. Although it does seem like MC has more bad days lately. I think that pool's strategy relied more on luck which is better with more hash power.. just my educated guess though.
edit: I was on MC for about a month and more recently have been trying Waffle while watching new pools with great interest.