Yf i think you are close to right with what you are doing,remember that oil sits in the glo hole around the plug and with my inverted saitos i have to the glo heat on for 30secs and then give the engine a bit of a caning to get the plug red hot aso it will idle long enough to taxi out and get in the air.The rest is easy as the fuel level goes down in the tank and the engine leans out a bit,easy to throttle back on finals and know the engine will idle in the air reliably then,good luck.