Fatboy,
Don't take this the wrong way, but...you've been asking the same question and/or types of questions for weeks now. The answer is still the same......it all depends!  Polish and sanding grit does not increase carry....carry is produced by entry angle....entry angle is produced by your style, the ball, and the conditions..........it all depends, there is no answer to your question........
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JEFF
Better....much better!

Edited on 3/10/2004 8:25 AM

Sanding, rougher than the ball's current finish, will reduce the length and make the ball hook more overall. It will help on carrydown, but the ball will grab more and earlier, so you will probably have to move your feet deeper at a minimum.

If a ball is at 800 grit, and you have trouble getting to the pocket, you either move your feet further outside, or you sand (before the league or tournament starts) the ball slightly rougher, say to 600 grit. The ball will hook earlier and more; it should hit the pocket fuller because the earlier hook adds a measure of control, by making the ball's path look more like a banana shape than a hockey stick shape.

If the ball is at 1500 grit, then you'd sand it to 1000 or 1200 grit to achieve a similar result.

If the ball is polished, then you want to "crack" the surface slightly and with small amounts of hand pressure with a Scotch-Brite nylon pad (grey: 1000 - 1200 grit or blue: approx 1000 grit). You do this gradually and in stages, until you get the reaction you need.
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"Just because you can do something does not mean you should do it."

Something else to remember is this. The rougher(duller) you have the surface, the more tendency it will have to "roll out" if your release is not strong enough to keep it going.

 Something I often see is a lady will come in to buy a ball. She is throwing an old plastic (polyester) ball and wants to buy one of the new "hook" balls, meaning a reactive.  Despite our best efforts to help her, she ends up unhappy with her new ball because it "quits" on her. She doesn't have enough Hand to keep the ball "alive" because due to the increased friction, the ball burns up the energy in her release far sooner than her old ball, and "rolls out" on her.

 Be sure that as you go rougher with the surface that you have enough release strength to utilize the duller surface or this will happen to you.  You see a lot of people even on this site that buy a monster ball, then complain that it "won't hook".  This is, in my opinion, most likely what is happening to tham. They just don't have enough release to use it or are trying to use it on an inside line without enough release to make it "turn the corner".
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Just call me Darreyl, it's much easier to say!