Sounds like you have the same problem i have...
this is what i did today.
I have a black truck... see here...
http://www.autopia.org/forums/showthread.php?s=&threadid=32603
anyways, i was working today in direct sunlight

shocked yeah i know) anyway, you can see every flaw possible in the paint. i saw the "metallic effect" that you saw along with VERY minor spider swirls. so of course i grabbed the PC and proceeded to try to get it out. (i was over at sonnydaze1's house and had him watching so he can back me up)
1Z Paint Polish w/ White pad...nothing
1Z Paint Polish w/ Yellow pad...nothing
1z Ultra Polish w/ yellow pad then 1z PP by hand (for marring)...nothing
1Z Ultra Polish w/ WOOL pad then 1z PP w/ white pad...NOTHING!!!
DACP w/ white pad... Still there
well by this time i'm like :angry about to throw my PC across the street.
Darren reached for his rotary, but we decided that would not be the best measure. At the sacrifice of my precious clearcoat i would have a perfect finish, but since it was a daily driver and most likely the marks would be back after a few washes, we decided that it was best to leave them.
Do i have a shiny truck...yes (see the pic above)
I learned that on a daily driver, the autopian holy grail is achieveable, but not always the best way to go.
hope i helped.