Ok so I probably should not have dove into a chassis I don't know but it's late and I'm ambitious. What you are doing with these caster blocks is changing the bottom mounting position of the king pin. Assuming you come from big cars think lengthening or shortening the lower control arm. Looking at the Phantom info it looks like the degrees are telling you what the king pin inclination would be if you were to adjust the top all the way in with that caster block and not what the caster would be. So we know that on the RF the higher the number the more negative camber you could put in it and the opposite on the LF. This would also effect scrub radius which is way more than I can handle after midnight. There are many people here that can explain this far better than I so hopefully they will have some input.
If you are interested in reading about this I highly recommend "Understanding Chassis Theory and Dynamics" by Mike McCarty.
I also should note that it is further complicated by the fact that the spindles themselves will have camber built into them to allow more camber with less king pin inclination.
