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@𝔒𝕨𝖑𝘡
OK, must be the mad gainz I've made.
Here's my experience:
Owned a p2m a couple of years ago, used with q-rings, tested and tracked FTP.
P2m stolen, over a year passes.
Bought Amey's p2m, used with no-q, tested FTP: much lower than previous.
Fitted q-rings, done a few rides / workouts (no test yet): same workouts I did with no-qs now feel much easier.
Possible that a difference in chainring bolt torque might be responsible?