I agree that you should build per the plans. I have a Hog bipe that I'll be building this winter.

The left-turning tendency is due to P-factor and is entirely normal. Don't build in a correction for something that's experienced for a few seconds at takeoff, as that 'correction' will work against you as the speed builds up. It's normal to need right rudder in the climb when speed is slow, little or no rudder at cruise, and left rudder when descending at high speed with reduced power. Same as in full-size aircraft with props. [8D]

Ed