If I understand it correctly, the really big problem there is that the upper control arms are not perpendicular to the axle and this is done to control side to side movement. Movement that simply doesn't exist when you add a panhard, as I've done.
Mike Moss said they're actually working on bracketry that attaches to the stock brackets to allow the upper control arms to be mounted exactly perpendicular to the axle, since anyone who uses their car on the track to any large extent is using a panhard, so making the uppers perpendicular solves a lot of problems.
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