5% is still okay in my book, but that's about the limit. LiteGuardian does 2% PPS, and it's not doing any hybrid.
The reserves a pool needs to handle the swings of PPS are too much for it to be a consideration. Combine that with the block withholding attack risk that can drive the pool bankrupt it's not worth it.
I love mmpool with out PPS, the fact that OP even added it is really wonderful. Just saying...