I was thinking the Hanger 9 Hellcat is a .60 size plane often fitted with a .90 4c and more recently a Zenoah G-20 ei so you likely have more power than the plane can easily manage. Reports I heard were the G-20 really hauls the plane and I have both the G-20 and the Saito 1.25 and the 1.25 puts out 400-500 or so more revs than the G-20. That it takes lots of right rudder on takeoff with a full throttle doesn't surprise me and the scale plane may not have enough.

If you have a Saito 90 on the shelf, going to it would cure the torque issues and fuel issues if they exist... I know the 1.25 eats fuel and likes a 24 oz tank.

btw, I've been drooling over the Hanger 9 Hellcat