RE: Glow Plug
Be real careful, that Master Airscrew Formula 1 prop is way over factory rating on the ground at 19K, even factoring in the cut down. 17200 for Master. Will it let go, I don't know, but I would never be in the plane of the prop arc. It could let go in flight as it unloads, if it does it could kill the plane, engine or both if it throws the blades.
When adjusting the needle be as far back as possible, even better use a servo driven remote needle, which is how most guys adjust these engines during flight. Remember to keep spectators out of harms way.