Seriously, how many times does it need to be said? With DGM (as with many non-crappy payout methods), round payouts are somewhat independent of the length of the round. I don't know if you noticed or not, but each round gets 25BTC from generated coins and pays out in the neighborhood of 25BTC. Of course the pool credit isn't going up super fast - blocks don't generate more than 25BTC no matter how long they take to mine. A 10% block pays out in the neighborhood of 25BTC, just the same as a 1000% block would.