How to set the ball diff?

[KyoshoK]

Hi was wondering what is the correct tightness for the rear ball diff?

The setting I do is, to set it so the hex driver is hard to turn. then i like to back it off around 1.5 to 2 full turns. Is this too loose? Will it wear the ball diff prematurely?

I dont like it when it is tight as per the instruction sheet coz it makes the car feel like its rear wheel drive. Hard to get rear traction and good holeshots