when two tires are spinning together, it is going to walk sideways... That is why you need traction, to move you forward and control the sideways walk. I think you guys just need more time...everything I ever had was posi trac....my cars are finally normal again... but it you want to race with one slick doing the work, so be it, but I will stay with the two...once you figure it out, you will launch forward, grabbing gears, rather than the steering wheel...traction is your problem now...which is a very good problem to have...hope to take the cars up north for a test and tune next weekend if the weather holds...
Right out of high school, I worked part time at Norm Paddock's shop. Norm raced a gasser, Opel GT... 600hp in those days, which eventually led to the pro stock class. Imagine a tubbed Opel GT, big slicks in the back, bicylce tires on the front. Wheel base has nothing to do with it. Norm would pull the front wheels and lurch forward...traction is where it at...if he broke loose, he would have to shut here down... When racing those early pro stock classes, he was racing pintos, vegas, etc...all shorter wheel bases than ours and twice the HP...Norm was building Pro Star Chassis then for the pro stock series. The guy that did my head work on my Camaro back then, was a guy name Glidden...ever heard of him....lol