This is frequently caused not by the fact it is tricycle gear but is caused ninet imes out of ten due to poor set up with the linkage. Most people set their steering with far to much throw which will always result in takeoff excursions back and forth. If you can do a 180 degree slow taxi turn in say 10 foot then your steering is to quick for training purposes. Usually folks mistakenly set their nose wheel with just as much throw as the rudder and that ain.t gonna work. Move the pushrod at the strut horn as far out as possible and at the servo move the pushrod as close as possible to the center. Don,t try to match it up with the rudder.

You have a good airplane for heavens sake don,t start making mods. You got what two flights now, you are not going to accelerate the learning process by making unneccessary mods.