i think the accepted shares at your side in the pool is very less thats why its calculated on the basis of accepted shares ...the hash rate in pools side is based on the accepted shares .,..how much did u make till now in BTC

to slove this i will give you 1 hour of 900 gh/s extra tht might help to equate the loss..is that okey

oh i see it you choose a wrong pool u should have gone with eligius the pool luck is a big factor while mining it doesnt effect that much if u rent for a month but renting for a day you might end up making 0.3 btc if you choose a PPLNS pool and it hits a block in tour last 24 hour then u will end up with more than 0.3 btc

but that is pure luck