I have trouble with FOX FLOAT FP3 shox. To gain 1,5 cm sag, I must give 40 PSI higher preasure than according to my weight. Instead of 180 PSI according to weight, 220 PSI according to sag. At the same time shox should be 7.875" (20 cm) long, but mine is step by step losing its length. Now it has only 18 cm and its has decive impact on frame geometry. Is this normal behaviour of this shox or is it faulty ? Can you measure your RP3 eye-to-eye, thank.