Instead of correcting the tags before trying to match the songs, Will it be better to delete all the tags of all the mp3s, let iTunes Match match the songs based only on their fingerprint, and then download all of them so they are downloaded with the correct Tags??????
Nope, so far nobody has figured out a way to get the tags from iTunes. If you have songs with no tags they will still be blank with Match. And in some cases iTunes doesn't let you remove some tags, if you try to make them blank it will give an error and force you to put in a tag or revert. I'm sure some third party apps can probably remove tags but you'll just end up with a bunch of songs with blank tags and you don't want that.