Be patient while someone with similar experience sees your post. I have lots of experience hatching snakes, but I'm not a fan of cutting eggs. At least not unless one seems to be stuck, after the others have emerged. You risk them drying out & getting stuck, when they otherwise might have been fine- you also risk contamination or flies invading. I'd leave them alone, or maybe try to patch over the cuts with something clean & as sterile as possible, like paper or fabric-gauze.