When it comes to applying Future, I actually brush it on by hand as it tends to even itself out without any problem this way. The only special thing I could say I do is that I have a dedicated brush that I use, it is a 1/2" wide soft brush and its sole purpose in life is to apply future, when I am done, it gets washed, left to dry, and when dry it is hidden away until the next time I need it.
Perhaps you should try brushing a coat of Future onto your model to see what result you get? I have also heard that ammonia will remove the Future without damaging the paint, I have never tried this though so can not guarantee results.
Hope I helped a little?
Ray