Single flute cutters are by far the easiest tool for aluminum on these machines. If you are having trouble with a single flute, I would not switch to a 2 flute. The room for error is even less. I routinely run take a 0.003" per tooth chipload with my single flutes. The single largest contributor to clogging a cutter is chip recutting. Some form of chip clearing is a must. I use a decent dust collection setup. I don’t use any lubrication. Both Carbide 3D and @Vince.Fab have made some good videos on cutting aluminum. See below:
