I don't think I'd throw them away. Looks like you have a lot of biase edges there. They should stetch a little when you sew them in place and take care of your problem. I'd do a few, iron them, and see how they look. They may look great, and if you still don't like them, you can recut them and just make them a little smaller. No sense in throwing them out.
No matter how try or what method I use, I can never get perfectly cut patches. I can startch until I'm blue in the face, use fancy rulers, whatever, and still they are not perfect.