Has anyone measured spring pressures on low mileage stock springs? FSM says they should be 46-53 lbs at 1.417 inches - mine are coming in at 40-42 shimmed (did not get exact height with/without shims but they were not shimmed when I took them apart). The engine only has 45K miles and ran strong so I'm curious to know if such low numbers are *normal* and acceptable. Anyone have any experience to share?