You should make a request to people with more hashing power to join on the proportional side to get continuum out of this rut. Having no proportional blocks since May 30th is not a nice selling point that you want to maintain for much longer. I'd be willing to bet that a lot of people have left this pool after a week or two of no payouts.
That is very possible. But whether people leave or join the pool for reasons of no blocks being found is not within my influence. I will note though that if everyone switched from PPS to score based today, we would be in a much better situation as far as finding blocks goes. and the variance would be much lower. We would have approximately 30 ghash in score-based hashing which would result in more BTC earned even for PPS miners due to the 0 fee setup.