nashtm:

General power trim:

If the plane "Pulls left" regardless of throttle settiing the thrust angle wont cure it - something is out aerodynamically.

If the pull varies with the throttle use some washers under the engine mount to shift it to the right. Fly it to test, add more if needed.

Down thrust is adjusted the same way. If your elevator trim has to be changed with the throttle to maintain level flight you can add up or down thrust to compensate.

But.

If you want full aerobatic capabilities, this right and down thrust will work against you when inverted. Trim for full throttle in upright flight, inverted and full throttle (At the same neutral control and trim) will result in a climb to the left.

You pays your money and you takes your choice.

Bill.