If the paint is uneven, then probably a combination of not enough material (open up your material feed adjustment) and an either an inconsistent or not enough overlap. Lacquer doesn't have near the coverage of the newer paints, with that and the combination of a non-hvlp gun and the high air pressure it's going to take a lot of concentration on your overlap to get good coverage. Are you applying single or double coats??? The gun and material used are probably also combining to give a very low efficeiency transfer rate.....