Neotac Control-It gives length and a tamer backend. Unfortunately, it also bonds to the surface of the ball. Once you have it on there, you have to sand the ball to get it off. That's not really a problem, it's just a lot of time on the spinner if you put Control-It on the ball and then decide you don't like it. You'd have to sand the ball to get the Control-It off, then polish it back up to where you want it with a regular ball polish.
What Control-It has in it that produces it's effect is something called a "slipping agent." I think Track makes a similar product, but I don't remember what it's called, if they do.
Shiv
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Listening to the monotonous staccato of rain on my desk top