I can say this, 1 ton of streak ammo is not enough from playing mech with this setup. 3 tons is generally good depending on your playstyle. When I was using the Golden Turd I can easily finish 2 tons of ammo during rounds of close engagements, sometimes finishing the third ton. So, it is a matter of how the round goes and the like. you can always choose to bring less, but don't go crying if your ammo runs dry. I you do so I suggest using config 1, and swap the streak ammo for lrm ammo.
