Shots Fired: A Machinist Guide

[Sayeth]

First of all, reading this topic really helped me a lot, so thanks to all.

Actually i'm testing the damage after the last patch on a dummy, and i read a lot about the "Full Time GB".
But, actually if without GB i'm doing around 670 + 350 (Split Shot + AA), with the GB i'm doing around 850 (Split Shot).
Ofc this was an example as i tried this with every damage spell, the only difference i see is the possibility of using Ricochet and Gauss Round with GB.

So, what i wonder, is really better to go full GB instead of using it at every Reload / Wildfire?
Because the only big damage difference i see is with crits and ammunitions.

Edit: I'm 170 ilvl, using gear that give me a total of 583 crit rate and 516 det.