Guys, I just started flying 3D with Diablo, had other 3d EDFs before, and had a couple of sudden pitch up on take off. I have 220Rxi in mine and previous owner had put in a fuel bag. I noticed fuel bag extremely close to turbine. So last week on my second flight a sudden pitch up on take off at 70% power, I pushed elevator and reduced my power and all of sudden I had a flame out. I am hypothesizing that the fuel in the bag conformed to the turbine intake and caused suffocation /compressor stall.
Nonetheless I need to fix the fuse and will go back to regular tank and will reduce the elevator to 20mm. Is it possible that my TV is not trimmed (to the thrust line of tube, how best to line up the TV to tube?Could the plane be too nose heavy? any other suggestions to avoid sudden pitch up (Obviously not pulling elevator too hard, I realize, I just nearly touch the elevator and it lifts off.).

Also, in the manual it recommends to put the overflow (tank vent) near the rear of the fuse. Can you tell me why is that recommended. Can I just put it right under the tank?

Thanks
Jason