M/T Pro Bracket radial

Spins at anything over 17.5. Tried bars in both holes with various preload and all the shock settings. They worked OK with the bars in the bottom hole, 1/4 turn preload and shocks at 7 with 17.25 psi. I used them at a really good track, and was 5 hundredths slow on the 60' compared to last year. I ran them on a cool day at our local track and there was no way to get them to hook. I dismounted them and went back to regular slicks.