Post a video if you can .
My guess is it needs to go tighter on the rear shocks .
Might be easier to just go full tight on both ends of the shock and start loosing it up . ( when it stops knocking the tire off at the hit )
I use the cope 2nd gear leave trans brake and have been 1.19 in the 60 ft and should be able to go mid teens once i get more aggresive with it . ( 3250 lb demon on the pro 275 tire )