IIRC, pbm coilovers are kind of overdamped on the rebound side, which, quick bumps or fast transitions, the coilovers go down before they can come back up and you end up pretty much bottoming them out, and they stay there until you get to a smooth part/stop making quick transitions and they have time to come back up.
Going by the general coilover adjustment, which just makes rebound stiffer more than anything else, I'd imagine they would work better at a softer setting, and simply getting stickier tires. To counter the oversteer you might want to try making the front stiffer than the rear though.
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