The right thrust built into the firewall of the Pitts is intentional. Without it, the plane would be very hard to trim out for aerobatics.

I'm flying mine with a Brisson 3.2 gas engine, and when I power up for take off I still have to input a lot of right rudder to offset the torque.

The size of this plane dictates that a larger engine be used than a lot of people may be used to. Great Planes actually did us a favor by building in a SMALL amount of right thrust (about 1/4"). Without it, we would all be adding washers under one side of the engine mount to correct a left yawing tendency. It also helps the plane roll fairly equally both left and right.

Don't change a thing. Just center your engine in the cowl and everything will work out great. It's a good flying bipe. Keep the speed up on final and don't cut the throttle to idle until landing is assured. Just like the full scale.

Silversurfer