I have run the engine in as recommended by David Gierke in his article in Model Airplane News and have used almost a quart of fuel. The engine starts easily and idles reliably in the hanger but cuts as soon as you bring the throttle back to idle at the end of a 100ft takeoff run, during ground handling trials on a new plane. With the glow starter connected it idles perfectly. Given that I am flying at 7000ft would it help to switch to a hotter plug (currently using an OS #3), higher nitromethane (currently using 10% TowerPower). During ground handling I leaned it as far as it would go before the rpm dropped to try and keep it hot.

Advice please.