Can you post pics?
Do the scratches go through the black paint and show primer?
Are the scratches deep enough to catch your fingernail?
What kind of buffer are you using?
For anything other than very faint scratches in the clearcoat, you are going to need to use varing strengths of polishing compound (not swirl remover) to correct the finish. Starting with more aggressive polish and working your way up to a fine polish...much like sanding wood with coarser grit sandpapers, then medium grit, then fine grit. If the scratches are deep in the paint (below clearcoat) and/or through the paint, you can make them less noticeable but you won't be able to remove them without a repaint. If you are not experienced with a direct drive polisher, you can easily ruin your paint. Your best bet for DIY correction is with a random orbital polishing machine, such as the Porter Cable 7424, Griots, or similar...and a lot of patience.
Go to YouTube and search for Junkman paint correction videos or visit Adam's Polishes website for how to videos
http://www.adamspolishes.com/t-videos.aspx