I personally feel that Wether it's VTA/USVTA/USGT. Those need to stay alone. They are prefectly fine. They are the stock 2wd buggy/ stock short courses of on road. What needs to get addressed with 1/12 scale/ WGT and TC. I personally believe that on my track the fastest gt drivers are only .3-.4 off the fastest TC pace. I feel that TC should just go to straight 13.5 blinky and that's that. That will allow for sufficient speed gap for drivers and classes. As for 1/12 scale and wgt pick a motor and battery. Then run both them together. They do it in real racing look at Le Mans they have a GT3, GT2, and GT1 class all together. In Japan, GT500 and GT300 run together. Just get better bodies. Anything is possible but at the end of the day it depends on how the local hobby shop as well as follow of drivers race every weekend. As for F1 I could care less if it gets a 21.1 or 25.5 motor.