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The thing that got me started on this is the new converter we put in. It knocked a tenth out of the 60' time. It also caused use to change our shock settings that also affected the 60' times. That just raised more questions for me about the IC. My son thinks I should just leave it alone but ..... I can't . Thanks guys. 
Don't. That's how you learn. The good part is it doesn't cost anything but some time and you can always change it back. Try the top bar at about 12 or 13 degrees and the bottom bar about 1 or 1 1/2 down. Shock adjustments will likely be needed after any change. With 52 percent on the rear tires and almost 12:1 effective low gear, the suspension won't need to be very aggressive.
Video it at 30 or 60 frames/second if you can and play it back a frame or 2 at a time. That's when you begin to see what's really happening.
If the results don't match the theory, change the theory.
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