I find that if the traction is quite high/average B0's is a good position for all the blocks.

A3 is 1mm lower than B0 and I think if you lower them all to this it would help gain traction when the grip is lower.

Another option is to use all B0's except for the Front front blocks to angle the front wishbone. And then putting on 6degree caster blocks to give back 2degrees caster, lost by angling the hingepin.
Doing this prevents weight transfer going forwards as fast so can make the car easier to drive when coming off power, or understeer..