So many Bullets, so little bag space

[Mega Ultra Chicken]

I'm in a bit of a pickle for choosing PAs for my lowbie Newman gunner. He is both a Guntecher and Fortegunner (I may potentially go Gunmaster on him too,) meaning he would probably need more than 36 PAs. However, because I don't have premium (nor am I in any position to get it,) his space for PAs is limited. Which PAs should I go with for a gunner with two classes and little bag space to spare? ...Or would it be better to stick with one class?

What I have so far: (Putting me at 36/36)

-All elements for Rifles, Shotguns, Laser Cannons, Longbows, and Crossbows
-Boma Duranga for Grenades
-Resta
-Samegid and Sabarta
-Rabarta