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pgt: The problem (as I see it) with your proposal is that it doesn't just measure the speed of the player, it also measures the speed of the opponents of the player. With your proposal, a slow player that plays mostly against slow players will still be able to collect "fast player points" - his opponents aren't fast so it's easier to be below the 10% margin. A player who plays against fast opponents has to work a lot harder to get below the 10% margin.
I think it's the intention of your proposal that the second player gets ranked "faster" than the first.
(kaŝi) Se vi restigas la musmontrilon sur la piktogramo pri lia membreco, aperos ŝpruchelpilo kun liaj ĉefaj detaloj. (pauloaguia) (Montri ĉiujn konsilojn)