In the Convair 640 (RR Dart) we matched engine RPM and ITT. First we would set and match engine RPM to 14,200 and then use fuel trimmers (toggle switches) to set the ITTs to 770. This method maintained a set RPM but reduced power output and temps. This is a pretty ancient airplane and the other TPs I've flown do not do things this way. The other one I've flown had P&Ws on it and we matched Torque.