ive tried a few different types but never really been happy with them even with a flow coat 

Have never come across acrylic enamel 2k paints here. Can probably get it if I searched for it, but everything here is either 1k acrylic or enamel, or 2k polyurethane (generally an acrylic based polyurethane, polyester polyurethane certainly isn't common). I prefer polyester 2k's myself, but they are special order and have an extremely short shelf life.