Tim,
Zero paints are all base colors, meaning they are not supposed to be glossy. They all require a clearcoat.
Zero paints are also what we call "hot paints" - solvents will melt the plastic if sprayed directly without primer. You seem to have that covered, so the only reason I think you got the orange peel is spraying too much paint without letting the previous coat flash - 2-3 minutes is not nearly enough.
I'd strip the paint and primer, and start again. Easier that way.
To strip, just find a suitable plastic container and fully submerge the body into 91% isopropyl alcohol for a couple of days. Have to be 91% or higher. Paint should come off with some brushing and you will be good to try again.