cryptohunter are you sure the pool rate has been constant for updamoon? 
Just taking the current pool rate and looking at the no. of coins found, 10, in 24hr for steadymining (16MH/s) gives 1.6Mh/s per block or 0.625 blocks per MH/s
doing the same for updamoon now 479MH/s and 316 blocks gives 0.66 blocks per MH/s

This fluctuates for both and obviously at any minute one miner dropping from the smaller pool will make a much bigger difference to figures like these.