I think you didn't cut deep enough. This is a 1998 boat. The description of the 920 says:
. . .
Mild-cut, compound removes film, light oxidation/discoloration/chalkiness, and tough stains from fiberglass boat finishes. Restores original color and gloss and facilitates the easy application of Collinite’s last step waxes; improving wax bond, spread/coverage and durability. Handcrafted and hand-poured in the USA.
. . .
You have to decide if you have "light oxidation" or "heavy oxidation". If heavy you probably need to wetsand and then hit with rubbing compound before you go to the 920.

I would start over on another spot. Sand with 1200 paper, then 1500 or 1800. Then run your buffer with rubbing compound, then pollinite and wax. See what you get.