I have the teflon strips between the leaves of the front springs,
but the car shouldn't bump steer just because the front end
suspension actually works. The front tires are wide, they will stand up my themselves....so the front end is not moving around because of it's light weight. I don't see how the tire pressure could have much to do with it.

I was a truck driver before I retired, and have driven a few trucks that bump-steered. It is in the design (poor) and you have to live with it.

For now I'm going to reverse the knuckle on the Pitman arm and
gets things as parallel as I can, then get the front end aligned properly. I set the toe-in my self at 1/8" or so. If all else fails, I'll get the Uni-steer rack and pinion set-up for it. Last month at the L.A. Roadster Show, I was parked next to a Guy with a Deuce.
I told him about the bump sterr. He had the exact same front end as mine. He said his was terrible too, until he got the Uni-steer.

Another place where the bump-steer is real bad is on a freeway. There are lots of over passes with irregularities, bumps and dips
and you are at high speed. If you hit a "rising bump" the front will compress....get light...then compress again. A second later on the other side of the over-pass, the car will do the same routine again.

The best thing to do with the steering wheel is nothing, don't try to chase after it, because the steering in the car is too fast, and
it just makes it worse. If you do nothing, the car will swerve one way, and then the other....returning to aprox. where it started

Daver.