I have aftermarket lower control arms and relocation brackets.

Which setting should I have them set at for best launch/traction? Right now they're bolted to the lower hole in the relocation bracket....should I keep it there?

 

yes...keep it there.

that gives the best angle for the LCAs to maintain proper axle geometry.

 

What ever posistion keeps the LCAs as parallel to the underside of the car and pavement as possible is the right posistion.

 

actually i think to give the best leverage to prevent the axle from rotating you wan the rear of the LCA as low as possible.

think about it...

if you are trying to turn a big crank (center point is the pivot like the axle is), would you want a long handle where you are applying alot of torque to it or a short one so you are cranking really close to the center?
it's the same concept only in reverse.

you want to keep the axle from turning (pivoting) so the longer the "handle" to hold it in place the better. a longer "handle" would mean having the LCA mount as far away from the axle as possible.