Values fluctuate constantly and some currencies can take days to mature and exchange.  It seems like people are putting way to  much focus on trying to tie hash rate to daily performance. Point your miner at the pool and see what you average for a week or two.  I've generally noticed that if my payout is low one day it gets made up for with a great day at some point.  Another good thing to remember is that past performance is no guarantee of future performance.  heh..

Chad