Well, if your track is small and tight, requiring a lot of braking, I would suggest using diffs, even if you could use foams I would suggest full diffs.
I find that 30,000 in front and 5,000 in rear is the best if you have tight 180's and similarly tight, abrupt corners. 100,000 is too much for my track as I need a little more turn-in than that will provide. But it depends on your track and your driving, so I can't suggest the best setup because I don't drive at your track.
Have you asked what other drivers run?