I replaced my 24" compact Ariens this winter with an Ariens 28" Deluxe model (ST28LE) and am having issues with the thrower pulling to the left. It has the wheel lock trigger and i have the wheel lock on when using the auger and blowing snow, but the machine keeps pulling to the left. I have to fight it to keep in straight line. I contacted Ariens a month ago, suggested i check tires to make sure they are same size as well as make sure shoes are same height. I did adjust shoes a month ago when had last storm hoping that would solve issue. but this morning got a surprise storm in CT, not a lot, but enough to pull out the machine and again it was a struggle to keep the machine straight up and down my driveway. Any ideas?