Try DCC Concept in black, it's a single stage urethane. 9000 is the base black, 9300 is deeper black. Also, would suggest trying SU4985 universal matting agent instead of DX265, it's a nice flattener that won't make the paint look chalky.
While some prefer spraying with rattle cans, that's perfectly fine, but a catalyzed paint will usually be a more durable finish, resistant to oils, chemicals, water spots and easier to clean.