The delta-winged darts, in their clean simplicity, contrast sharply with the Phantom, which seems to have wings, tail surfaces, and other appendages sticking out at every angle. This may fool you into thinking you are making a mere paper dart. But you aren't. You are making a wonderful paper airplane that has all of the characterists of a great flying machine. There a couple of special challenges with a delta-winged paper model met by these designs.
Most paper airplanes find stability by being high-winged airplanes with dihedral wings.
The real Mirage and Delta Dart, and these models of them, have anhedral wings, yet they still find stability in flight. These paper airplane models, like the real airplanes, do not require excessive up-elevator. I think you will be very pleased with how the Paper F-106 Delta Dart and the Paper Mirage 2000 fly. Make a squadron. Make the other members in the 60 degree delta wing family.