[Trackrash]

I'm no expert, but I have done this a couple of times. If you have the factory manual there is some information on setting up your R&P that is helpful.

You are half way there. You know what your total shims are. Now all you have to do is adjust that total side to side to get your back lash set. Lots of fun right?

I would start by switching the shims you have in there now from side to side and re-measuring your backlash. If you are lucky it will be OK. If not you should be able to calculate the final thicknesses needed and use the shims you have.