Leonidas, Thanks.
Regarding: "The main difference till now was to ad polish or not, both 4000 2000 even 1000 become very flippy with polish. 1000 was for me almost unpredictable on a THS."
Be careful with polish if you have your own spinner, but more so, if someone else does it for you. The amount of shine you put on a ball AND the type of polish can make a HUGE difference.
TYPE: there are non-abrasive polishes that won't change the underlying grit level and there are abrasive ones that will change it. However more depends on how hard you press for how long and how much polish you apply.
Options:
1. If 1000 through 4000 grit PLUS polish are still giving you too much over/under, try 4000 grit with NO polish, often called "matte".
2. If 4000 matte is too early, try 1000 grit plus A VERY LIGHT AMOUNT OF POLISH. If possible apply it by hand to get the minmum amount of shine and just the right amount of length. If you need more length, try another HAND APPLICATION of polish. If you need still more, try a spinner still using the least bit of polish and pressure that will get you more length.
3. If 4000 matte is too long, try 2000 grit matter (no polish).
The whole object is to take as small a step necessary, so as NOT to pass the stage at which you need the ball. PLUS it must be tested at least twice to insure it is where you need it to be.
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