I had to switch to another pool because I was earning more with their share difficulty. Now that yours is the same (31), I'm back here. It's weird how much your earnings are affected when share difficulty isn't set to something that's optimal for your hardware.
hmm, under optimum conditions the small change I made shouldn't make much, if any, difference at all in your payout.
I suppose if the stale rate is high or if your pretty far away from the server (network lag) than it might increase it.