Do you have a link? I can’t found the correct trusty website :-( Edit : is this ? https://www.intime03.co/blancpain/5366-fifty-fathoms-bathyscaphe-black-ceramic-gf-1-1-best-edition-black-dial-on-black-sail-canvas-strap-a1315-free-rubber-strap.html
I can’t open the link .. but yes the curve is barely noticeable, so you can leave the middle link how is now ! Nice work , I have to do the same on mine
If You check a gen bracelet was little convex (like the other mid link on the bracelet) but not straight flat like the cartel one.. See pic from chrono24