Need help with optimal tire contact with road

[HoustonGT]

Hey, i have a 2015 A6 premium lowered on eibach springs with a whipple. For looks, i went with 305/35 r20's on the rear and -2 camber so i wouldn't rub. Obviously i don't get great tire to surface contact with the large negative camber.
Anyone know what the best tire width (and rear camber) would be to get better contact on the rears staying with the 20" wheels? I asssume slightly narrower with less camber would get me better launch traction? Thanks in advance!

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[Grintch]

Turn harder and - 2 is where you want to be.

What wheel offset? As you shouldn't normally need camber help to fit a 305 on the rear.

 

[Angry50]

as said above, what offset. should be 40-50mm and should be able to run 0 camber if desired. for a daily -1 to -1.5 seem about right.

 

[HoustonGT]

as said above, what offset. should be 40-50mm and should be able to run 0 camber if desired. for a daily -1 to -1.5 seem about right.

They are 20x10 with 40 offset. Running nitto G2 305/35r20. Thanks for any help you can pro ide.

 

[HoustonGT]

Turn harder and - 2 is where you want to be.

What wheel offset? As you shouldn't normally need camber help to fit a 305 on the rear.

40 offset. Eibach pro springs. Had lots of rubbing before having to go with -2 camber.

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