thats a problem all spray cans have. Instead of spreaying an oval pattern like an airgun would so you can overlap 50% and cover your tracks, spray cans have a round pattern that makes it extremely hard to keep even.

I have the same kind of pattern on my lower panels that I used semi-gloss black on. Its not really noticable because its a flatter paint, but I'd never use a spray bomb anywhere except really tight curves, to get in hard to reach areas like behind door handles, and of course door jambs and hood and trunk areas