Need help determining good setup for my Gunner style

I don't play Gunner often, but when I do I tend to rely pretty heavily on the mortar, since I target enemy turrets/bots a lot when I'm not fighting players. Anyone have recommendations for what endorsements could take advantage of this?

Rate of Fire
Clip size
Reload Speed

Or, for a better balance of the three (with Minigun, that is)

Clip Size
Rate of Fire
Reload Speed

I used to use this on Assault as part of my Grenade Launcher set-up. Worked well. Still use Clip Size as the Gold and the grenade launcher just shoots all day - real good for taking out Turrets that have been overhealed. Rate of Fire is the single best slot for the weapon because it helps in places where you just slightly miss or need to get a lot of damage down fast. Reload Speed... meh. As bronze it probably doesnt do enough, therefore:

In my current Gunner set-up I have Clip Size, Rate of Fire, and Armour.

I just posted a heavily mortar-based setup in the topic "Hilarious Gunner Setup" I think I called it, might wanna check it out