I noticed that the push rods connecting my servo to the steering arm is very weak and bends easily. I think thats whats causing my plane to behave erratically on the ground also it seems to be interfering with my throttle push rod. So I went out and bought Sullivan gold push rods 2/56" size which are far more rigid. I am also going to reposition the throttle servo arm so it doesn't interfere with the steering arm. I hope that will fix it, since it was quite a bit of work un-mounting the engine and drilling holes in the firewall for the larger push rods. Lastly I am going to take everyones advice and make sure that the nose wheel has very little travel compared to the rudder (10ft turning radius) and also test taxiing without the wing. Thanks for all your help!!