Any tips out there for tuning a glow engine for sustained hovering? I recently built a spa3d after having spent several years sport flying. I have no experience on setting up a glow powered 3D plane. The engine seems to tune really well at level orientation and have a great transition. I set the HSN about 1/4 turn richer than normal flying and it seems to be alright at WOT pointed straight up, but will not keep running more than 15-20 seconds at mid range when pointed straight up. What does everyone else do when setting up for 3D?