That sounds like it could be an extremely overdamped situation, as in the damper not really moving much at all or packed down. OEM bushings with coilovers doesn't really get you those effects but I do see where you're going with that line of thought.
ASTs can be quite good...we've noticed they are often valved very aggressively though. Some of the custom valved sets we've tested were fantastic but straight from AST they can be very stiff.
- Andrew
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