Since the negative contacts the paper, as long as the light hitting the paper is even, it's all the same to the paper, except, of course, in the case of dirty, or scratched glass, where a point source light creates shadows because of the problem glass. But again, no dodging or burning. Glass is cheap. Many if us print with condensor enlargers. There is debate (of course, it's photography), but many persons will tell you they are sharper, and have better contrast. Those of us who use them, know the condensors have to be clean, and scratch free, just like an enlarger lens, camera lens, negative, glass carrier, or the glass in a contact printing frame.
The best contact prints in the world have been made in various closets and darkened workshops with a contact frame, or just a piece of glass, and a bare light bulb, with no math beyond the exposure. The methods for outstanding contact prints won't be found in calculations. You'll find it it your negative, brought out by your practice, patience, persistence, and experience. But all means, experiment, nothing wrong with that. Thats how we get good, but you'll probably find the old wheel still rolls pretty good.