Lex,
Have you changed the surface at all? The last time you posted on this ball, you weren't quite sure what the surface because you had bought it used. You were thinking that the previous owner had possibly put a smoother surface on the ball. Well anyways, if you are not quite sure what it is, put it back to box, which is 400 grit with high gloss polish. If that is still not enough, then take the twoheadedboy's advice and use 220 grit with ruff buff polish. That should do the trick.
KD