Augmentations for automatic fire, burst fire, and single-shot fire

i want the automatic fire for mattock too but then i found the valkyrie to be better in DPS. Both are not automatic so the augmentation is ok
Losing damage but getting ROF gives more DPS even if the weapon will be worse vs armor

Single shot augmentation disappointed me.
To me "single shot" = Widow,Claymore...big damage in one projectile but here it just means that i have to click every time to shoot. it can be used to make and Avenger like a Mattock....but i don't want this!
I wanted a Dhan to do more damage on the first shot but having to reload after it.

Single shot bonus/malus

+30% damage
-50% ROF
+30% precision
-20% stability

So it must be used on high damage low rate weapons that are not already single shot. None of the weapons i use now. (Dhan/Valkyrie/Ushior)