When we ran on blacktop this summer i went to high up front to stop it from pushing, this seems to work well on carpet also...it seems to keep the front flatter and makes it steer. Interestingly today i took the front bar off and picked up more of a push, my car was just adding body roll and not steering more, it seemed better with the front shocks up a hole on the tower, and the bar in the back to keep the rear from being so lazy.
I would say it isn't too much of a difference as long as it feels good, back on the mid motor car we ran high pins plus a bunch of shims up front and regular low in the back.