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Obvious question is obvious, but I assume you are rigorous with your install/calibration procedure?
I sometimes get stupid numbers too, but more often than not it's after a recent bike change, and the risk is increased if I'm rushing. Also my screwy numbers are often associated with very lopsided l/r balance which I usually interpret as a sign of incorrect installation.
wish I had the cash to do that to be honest, second hand sale i'd probably get £400 ish, new PM is at least £650 for a proper one, and then id have to add in chainrings and put up with worse shifting unless I go for the quark elsa RS which i could use shimano DA rings on at £1k, so would cost between 4-600...
one for bonus time in January...
For now I'm racing on HR, not exactly ideal...