I think I have done all this…. Porterfield R4S pads (or is it RS-4), dual stock rear calipers (which I could inadvertently lock up before the fronts), replaced with SACC upgraded rear calipers, then a SACC Wilwood MC upgrade.
Finally got what I was looking for, but I haven’t really driven much else like my Pantera on the track, so hard for me to compare!
Rocky