Using a titan with texture cache enabled it seems to be performing with more luck. Granted I may not understand all the metrics on P2Pool but I believe the efficiency metric guages the rate at which I share vs. the expected rate and for 2/3 of a day I've been sitting at 120% whereas with the previous 4/09 build it was a little under 100% with the same time.

My hash rate average didn't change much but the variance did. I used to be 150khash/s to 290khash/s with a mean of 22xkhash/s. The gpu has never been consistently 100% utilized and my cpu sits at about 60% utlization. My hash rates now jumps between 350khash/s and 100khash/s settling with an average of 224khash/s.