gulliBell:
I've (inadvertently) had the throttle ever so fractionally slightly past the idle position before when it's lit off and it went very hot very quickly...reckon if I'd followed the procedure suggested here (throttle opened all the way then back to idle detent) then my tail boom would probably have been a molten mass of metal pooled on the ground.
You missed the throttle check before start-up then(also all the way to full-then all the way to close), not a problem with the start procedure sugested here.
Another version I've seen called "canadian start"
is when you are low on battery, just doing the full open-close to idle and set just below idle BEFORE engaging the START switch, works fine.