Hone your skills off season and know your guns
I may try the Iwata next year. I like the Paasche, and dont have much trouble with it (depending on the paint). The Graftobian has to be shaken up all the time because it settles, and clumps if you don't and that caused some clogging. But like you said, take it apart, clean it out good, and put it back together and away you go (I did a lot of taking apart and cleaning out this year).
Its something to practice with in the off season too. You can certainly hone your techniques if you get a couple of practice heads (makeup stores sell them) and just practice using the guns for different effects. Thats where my left over makeup goes from the season. I use it in the shop to practice new looks and honing my skills with the airbrush.