If you want to minimize bump steer and are not bound by rules, a small 1/4" vertical slot, not slanted, in the cross member (combined with strut spacer if you have lowered the car) is usually all you need. Quick and easy adjustments. And it doesn't take a $150 gauge to get in the ball park. I use what amounts to 2 square pieces of wood connected with a piano hinge. I place weights on it to keep it from moving on the floor. The free side leans against a wheel with what amounts to 2 nails resting on the wheel outer shell about center height. Adjust it until you get both nails touching equally. Remove the springs and sway bars, jack the car up and down through normal range of movement, and watch how far one of the nails will move away from the wheel. It usually moves A LOT. Adjust inner pivot until you can keep both nails touching through the entire range.
I think I mentioned before, 0 toe in the rear of my car really added to high speed stability. But your speeds are another deal.