Cool tune.
Yeah get yourself a copy of Melodyne. I use it on all my vocal tracks, no matter the singer and no matter how well they have sung the track. There's always something that needs fixing. THere's no shame in using pitch correction software. I guarantee that every singer you hear on the radio was pitch fixed in some way during the production/mixing. That's the reason that when they play the Grammys and other awards shows and concerts, they are singing slightly out of tune if they're not lip synched. Not even the best can sing in tune all the time.
Don't give up on a song if you like it too. I hear the entire "too close to the song" story. It happens. Mostly, with me, it's that I get locked into hearing it a certain way and have a hard time making the changes to it to hear it a different way. Set it on the shelf and forget about it for a few months. Go on a write and work on some other things to get the brain refocused on other things.
Then, play it again after that time has passed. Quite often, you will now hear things that DO need to be changed. Sometimes, just a subtle change or sometimes a complete and total redo of the production.