just picked up my new 2006 GT i-drive 5.4. noticed that the fox float rear shock had a bit too much sag (was set at 170-180 psi...i'm 238lbs). pumped it up to 220psi....disconnected the pumped and noticed it still had sag. checked the pressure and it was back to 170 psi. now i know some air will fill the hose but 40-50 psi !!? also...when i just lean over the seat and pressed down on the seat/bike i could hear what sounded like bursts of air from the shock...this didn't come across to me as a good thing. is this normal??? taking it back to performanace bikes today for a check.