For more low end, 1st try a shorter silencer/spark arrestor. Also a reed block spacer will help in the low end department. Carbon Fiber works has skid plates for the 65's, but I'm not sure how big they are. Someone said Moose was to be offering a mini aluminum skid plate as well.
My son raced his KTM 65 in a couple of GNCC's. It was still setup for mod class mx. Cylinder was ported for more mid to top. It worked surprisingly well, considering. We were using a Doma pipe with stock silencer.
Cycra has the pro bend hand guards available for the mini's. A good investment for hand protection.