I currently use a mix of kinetic and explosive medium drones as these are the two best types to burn through armor. I run one 650 arty gun instead of the third neut that burns down the shield with calderi EM rounds. For frigs I use 4 explosive and one em light drone. Fast, accurate, deadly.
I find that I rarely use all three neuts and two are plenty with my level 5 bonus. The gun boosts my dps and gives me another way to kill if my drone are destroyed.
Pilgrim is awesome ship