Raced my Scamp

Needs more go juice.... The jetting is likely lean. Might be another 30hp there. If it's got any ethanol in it, it may like a number in the 12.0ish range. You are going to be busy with the PVCR's and jetting up front.

Similar build went right at 105 in 5200 foot air.

Keep jetting it up until it slows down. If you jet up and can't get it to slow down, the fuel system is not up to the task.