How do I force iTunes Match to re-evaluate certain tracks
You may not be able to get complete matches, but here's what I have been doing in the cases where one or two tracks don't match.


Select the item(s) to attempt to re-match.
Right-click on them, and select "Create AAC Version"
When this is complete, hit alt-backspace, and choose to remove both the original and the iCloud version. Also choose to delete the items from disk.
Go to the "Store" -> "Update iTunes Match" menu item.


Note that this will keep the play counts, etc on your tracks. It may not succeed on every track, and sometimes repeating the process picks up another track.

Occasionally, I'll get a "Removed" icon there after doing this: just right-click and choose "Add to iCloud" on these.