Particle balls by design are smoother/more predictable than reactives. I would go with an Impulse Zone if I were you, but even though it is not a particle, I think that the Ultimate could handle Med-Heavy/Heavy for sure depending on the surface. Many people have had great sucess polishing up Ultimates,and the ultimate is not a backend monster like other balls, it should react more smoothly. Both balls should work, and the Impulse is my first choice.
This is all just my opinion though.
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Ben W.
Edited on 4/4/2005 7:53 PM