ORIGINAL: rc flylow
Is left thrust the way to counter the problem? (My logic tells me if the airplane is wanting to go left on power that right thrust on the engine is needed.)
Your logic is correct, your original design is flawed.
Model aircraft with tractor (front mounted) engines require RIGHT thrust (generally, about 2 degrees), and, depending on the design, possibly down-thrust.
Of course, to accomplish this, you're going to have to move your mount to the left to be able to re-center the prop
The need for down-thrust can be determined during flight. Fly at half throttle, straight and level, trim elevator for "hands off".
Go to full throttle. If it begins to climb, you need downthrust. If it begins to drop, you have too much downthrust.
Edit: The only time you would want left-thrust would be the left engine on a twin.