I did used to run 30k up front but found 50k gives less diffing out and straighter braking, did try 100k but after 2 runs I went back to 50k.
600 rear as my local track has a banking with a few bumps that would catch the car when off power, and using a thicker rear had the rear stepping out over the bumps, the 600 allowed time to react without causing other handling problems.
V-one S/S2/R/RR/Evo and FW05T/S/R/RR all use the same lower hinge pin in the rear (same suspension arm), if the 3racing item is the same dimensions then it should fit.
Only just started to build the RRR, I'm in no real rush.