Matt - good luck in the build! Let me know if you have any questions!
JRouche:
The easiest thing you can do to increase positive scrub is to put offset spacers in-between your wheel and hub. We used to make them for our test cars to dial in steering feel. Obviously, with too big of a spacer you won't be able to get enough threads on your lug nuts!
As for Caster, that's another part of the equation! Just like from the front view, steering force is proportional scrub radius, in side view, steering force is also proportional to Mechanical Trail. Thats the side view distance between your contact patch centerline and the steering axis. So, if you increase caster, then you move that point further forward thus increasing that distance and increasing the torque going into the system. Caster is bad for inside rear tire lift, but good for camber gain in roll! How much you ask? That all depends on your tire!
Speaking of tires, want to hear a trip? That 'center of contact patch' is never in the same location. In fact, with I wouldn't be surprised if, under hard corning, that tje tire's contact patch moves laterally 1-2 inches and under hard breaking, it moves 2-3 inches!
Don't believe me? Here's some cool videos, ENJOY!
Lateral Force
https://www.youtube.com/watch?v=nmo_d...eature=related
https://www.youtube.com/watch?v=W8UiE...eature=related
Longitudinal Force
https://www.youtube.com/watch?v=HldiiDmvTxI