I have a ST 2300 that I flew on a H-9 Ultra Stik for over a year. I have just sold the plane, kept the engine. Setup is:
Perry Pump and 5001 carburetor, 15% Nitro, OS f plug, Bisson Pitts muffler, APC 18 x 6 W FunFly prop, turns 9200 on bench. Great idle (1800), midrange , and transition. This engine has NEVER flamed out on me. Also one of the smoothest engines I have ever seen, almost zero vibration throughout the throttle range. With the Perry regulating pump (VP-30) you do not use pressure to the tank, just vent the pressure line from the tank to the outside.