Two thoughts for you......you say that it veers left at ANY taxi speed.......if thats the case, the nose wheel is likely adjusted a bit to the left. At very low speeds, it shouldn't go left. As far as taking off, I had the very same problem with my Avistar. That darn thing would go hard left and then I'd over correct. An observer told me that I had way too much throw. As my linkage was already adjusted to give the least throw, my only alternatice at that point was to use the EPA adjustment in the radio and cut down the rudder throw. I figured that as I was training, I wouldn't have much need for a LOT of rudder. I adjusted it so it would only me give me a few degrees of nose wheel travel......hmmm, maybe 15 degrees or so...just guessing. All my take offs were pretty decent after that. To give you an idea....prior to this adjustment, my wheel would go about 45 degrees each way.