hey lee82gx.... I got a good setup for all diffs...
tires: I use take off 32's (the 4pack that dont come with inserts) for my outdoor asphalt track. They got more grip than the hpi 33r.( which i also tried) with soft inserts cuz we race at night. and HPI 24mm 5 spokes.
front: -2 deg tamiya white spring, yellow sway, 50wt oil, top shock all way out. .7mm spacer under the front rear block.(you might need to shave off a bit from the block if you're still using the tamiya screws)
rear: -2deg tamiya blue spring, yellow sway, 40wt oil, top shock all way out. 1mm spacer under the rear front block. B rear block.
2mm hex spacers that come with hpi wheels on all four corners.
I run the stratus 2.0 body, gear it 72spur/29pinion or one smaller depending on your track. these are 48 pitch gears from robison racing. I use them for a tuned p2k2.
I find it rotates on a dime and hauls @@@!