From your signature I'm assuming your running 1/10 200mm. The 2mm split is basically used to give a slight bias to RWD and increase top end. Through the corners when the rears start to spin the front catch up and you get full 4wd. This is much more pronounced in 1/8th scale where you run 6-7mm split.
Just true them at 62mm rear and 60mm front and then leave alone. Just swap left and right side tyres over after each run to even out the tyre wear. You can also true a little camber onto the tyre as well. Probably about 1 degree that just helps the tyre be closer to the cars suspension geometry so the break in time will be less.
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