I don't find foams much faster than mini pins, whether they be new or scrubbed in pins. What i do get from using foams is a car that always slides but is very consistent and controllable. I do agree with 200sx though that new cut staggers have way more bite than the foams but again the grip levels on these changes race by race.
I find the foams more consistent than rubber which as you say dicky changes throughout the night's racing.
I'm hoping the drivetrain wear ends up costing less than a new pair of rears a week and new fronts every other week but will wait and see.
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