My first R/C airplane was a Falcon 56 with an Enya .29 IV/TV
I think aerowolf hit on it...
It sounds like you need to open the air bleed screw some...it's not very sensitive, so open 'er up some and try it...and keep playing with it until you get it where you want. My Enya .29 took quite a while to break in too...and FWIW, glow plugs take a beating during break-in because the wear particles can contaminate the plugs fillament and cause erratic running so it might not be a bad idea to try another plug just for the heck of it?

IIRC I had a 6 oz. tank in my Falcon...and isn't the tank a little on the low side in the Falcon? (don't remember exactly)