But whether people leave or join the pool for reasons of no blocks being found is not within my influence.
All I can suggest is enhancing your PR by promoting your unique current features, and implementing additional features as much as possible. That is within your influence, and people then just have to be convinced to come back by becoming aware of such things.
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.
Yeah, I really don't get why people who flock to this pool more often go with PPS than score based.