My setup is a TG bike with 10" tire and mine works great after 1 race and a call to MTC.
I will make several comments/observations:
-Talk to Kevin at MTC, he knows the baseline setup for your setup.
-Make sure your tire pressure and wheelie bar setup are correct for that tire.
I ran a small tire many years ago but these new tires are different so I would defer to someone familiar with the Reactor tire.
Otherwise I would be surprised that you are blowing the tire away.
If your were Budds Creek, MD it would be tough to spin the wheel at a MIROCK race.
Do not give up, once you have the setup right you will be thrilled with it.