No. In fact I haven't seen anyone, that's fast, run an engine that was anywhere close to making max power.

Everyone seems to be running restrictors around 7mm and 3-4 port mills like the +4 and OS XZB. Haven't seen a powerhouse like a 7 port RB WS7III with a 8mm restrictor in a while.

Run time and smooth power are currently trumping pure power output. You can also get slightly better mileage with 25% nitro. But for whatever reason 30% Sidewinder and Byrons works best for me.

If I had it my way I'd allow larger fuel tanks that way maybe some racers would opt for more powerful setups to kind of shake things up some. everyone running the same engine kind of bores me. I love seeing small .19 race mills going up against gas guzzlers like the .28xz etc.etc. Variety and unpredictability are the spice of racing.