Did you hand buff them or used an electrical buffer?
My cousin uses a lot of the 3m rubbing compound at his shop also. Might have to give that a try.
I used a drill with an attachment and also a polisher. I couldn't imagine how much more exhausting that would be if doing it by hand. Sanding the wheel grit by grit is tiresome enough. I wouldn't polish another wheel ever again, just too much work, even though the wheel looks great.
I even did the back . Can you tell I have a little ocd? lol
Before
After