I certainly find Future to be more difficult than simply spraying a gloss coat and calling it good. If I want a really nice gloss coat for difficult decaling situations, I find that it generally it takes me at least three coats to get anything that one would describe as "glossy". Even then, the finish still seems to have a miscroscopic pebbly texture to it, not enough to cause silvering but enough that I wouldn't want to try and use it for a gloss automobile finish.
I've used it straight as well as somewhat thinned with Tamiya thinner, and I don't know that I could really tell the difference. I've had similar results from both my Badger 200NH and Paasche H, typically spraying at 15 PSI.
Interestingly, a few years ago, I had similar feelings about Future and tried Foquil's Crystal Cote, which is an enamel based finish rather than acrylic. Interestingly, I had just about the same results as I get with Future. I think I sprayed at least three coats, and even then there was a bit of a texture to it.
I've also used Testor's lacquer based gloss, (Dullcoat without the dull) and was never too happy with it. If I laid it on to heavy, it would try and lift the underlying paint. And if I laid it on too light, I would get a badly pebbled surface.
I suspect my problems may come from not applying a thick enough coat, but I worry about runs, and err on the side of avoiding them.
Andy