You can determine your ideal tire pressure by taking a portable air bottle and a piece of "driveway chalk" (big sticks made for kids to color) to a big, empty parking lot. With your tires aired up to maybe 28psi or so, chalk a line across your tire tread side to side, then drive about 100' on pavement, stop and look at the mark. You should see the center worn off, leaving chalk on the outside (tire is crowned out). Let out 1 or 2 psig, re-chalk and do it again, repeating until it is wearing evenly across the whole width. If you get to the point where it's leaving chalk in the center you let out too much - add 1psig back and try again. This will put your tire contact patch even, maximizing both traction and tire wear. Any higher pressure will wear the center, and any lower will wear the outside edges.
A larger steering wheel will definitely help your steering effort if you have room for it while maintaining your driving position. You said "power rack", so a longer pitman arm is not an option...