1) As for tyres, for me personally the dog bone's work perfectely on the track I run on, those small paddle like things grip like crazy. No idea for the LPR's tho.

2) You'd have to experiment, I just changed my diff oil to 7 - 30 - 5 today, still havent had a chance to try it out. And it comes filled with grease from the factory. I got rid of it with a lil bit of Nitro, cycled the diffs around for a bit, a bit of water to wash it out, tissues and WD40 to dry it, re filled it and that was it. Most people run 7 - 10 - 5. That was too loose for me.

3) Again, you'd have to experiment depending on your track conditions, I run 40F - 45R. Ill be changing that too to 30F - 35R and giving that a go.