Floaties (barring someone fckn with you) sound like precipitated proteins, a very good thing and sign of a very rigorous boil. It is tru that you can temperature correct a hydrometer, but your asking for false readings. I would bet that is exactly what you got. I recommend Taking a sample of wort, putting it in the freezer or ice bath etc, get it down to at least 80, preferably no correction at all. When I take readings, I leave the hydrometer in my test flask, and come back later to take another reading, twirling and bobbing it around to make sure it is correct.