In my experience the guys in the US are a bit more conservative with their motor choice vs their skill level. In my visits over there for the Clash I don't think I've ever seen someone driving a motor they can't handle. But over here goto any random club meeting and 50% of the field are running way more power than they can handle/take advantage of.
It's us that are power mad
Years ago at Harrogate club meetings we ran the same 27t's in a stock class for a season or so and it was some of the best racing I've ever done. The cars were so underpowered and slow every tiny thing with your driving made a difference, and as everyone used the same motor and agreed we weren't going to fiddle with them everyones was the same speed.