Atpaula, Very nice shots with your new Fisheye-Zoom!
I have an old 8mm f/2.8, those also have a small blue edge, not quite as wide, but I trim them also.
I use a slightly modified version of this video instruction:
https://youtu.be/v4Jq2nIX9eEI think it can be made into a Photoshop action, although I have not done that yet.
I actually like your black trim around your shots.
Your lens looks sharp to me.
Thanks for posting your shots.