Thanks for all the input. I haven't had a chance to take the plane out yet... too much snow on the ground. In the meantime, I have checked my CG, 3 inches form LE. The wheel axels are approx 1 inch forward of the LE, ie 4 inches in front of the CG. Could this be contributing to the problem, or is this OK? Remember, this was originally designed for trike landing gear, and I modified it to a Tail Dragger. The tail is up approx 1 1/2 inches, due to the tail wheel, so the angle is only very mild. I have adjusted the tail wheel to turn left slightly, so I will be forced to apply right rudder while taxiing (per one of the earlier suggestions.)
Any input appreciated.