I took my Swinger to the track last week for some 1/8 miles passes with a new set of 27-10.50 15 Hoosier QT Pros (tubes, no rim screws). I started at 18lbs and worked down to 15lbs. My best 60 was 1.86 with 15lbs but didn't go any lower. I haven't been able to find much information on...