The first 3 were a bit lower for me, the last two a bit higher. May just be normal variability with c=210 (as per those maths links posted a few pages ago... )

Also I see pool hash rate now over 9100G - so I'm expecting lower payouts but more frequent payouts compared to a day or so ago when we were on low 8- something Ghash... (same daily payout on average until next diff change, of course).