Re: [1500 TH] p2pool: Decentralized, DoS-resistant, Hop-Proof pool
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You mean big enough like you currently are? If your payout system does indeed pay a 'relatively' constant N diff shares per block, then it at least doesn't have the obvious Prop issue.
My simulation for the naive PPLNS-on-DAG system gave about 1% typical variation in payouts when the number of shares per level of the DAG varied uniformly between 1 and 10. Note that the variation is not predictable: you can't guess how many shares per level will be mined in the future unless you're actively manipulating it (and large enough to do so). For the PPLKD system, your reward will be split over a constant amount of other people's work, so the variation due to changes in M should be basically 0%.