adjusted the bands on my 904 before going to the track yesterday. made 2 passes @6.74 and 6.75 next 2 passes were 6.80 and 6.79. the 6.80 was in the heat but the 79 was about 12 degrees cooler. but the shift from 1st to second seemed to overlap each other. second to third were fine . is the band to tight or too loose ?