Re: hard steering - radials or bias ply
My 34 is similar, but I figured it was because I have relatively wide radial tires on the front as compared to the 5.5" wide tires the car was originally supposed to have - lots of friction between the tire and the road. Mine are 8.9" wide. What width tires do you have? Once you are moving it steers OK. I agree that having them properly inflated makes a big difference - which makes me think it is the friction between the tires and the road. Your test on the plastic sheet would also tend to confirm this.
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