Flew the extra 260 this week after the following mods:

1. aligned the stabs with wings
2. added about 0.5 degree more up-thrust
3. added 2 oz of nose-weight

IT REALLY FLIES TRUE now. It flies perfectly level with elevators at 0 degree, which is incredible. When it slows down, the nose will not pitch up.
Stall-turn also easy to do and looks good. The 45 degree test shows no bad sign.