Version 2 upgrade

[mateba]

I know everyone in their brother asks these questions but I really could use the advice.

I use my G3 as a SAW and I want it to be dependable.
It now has:
EG700
M100 (old M110=350FPS)
Systema gears
8.4v 25 and 30 amp battery

mosfet switch is on the way
switching to dean's connectors and gold motor connectors

Will the upgrades below improve durability? Will they improve rate of fire? Am I taking the wrong approach and is there a better way? please help
Systema Shims Set For All AEG
Systema Bearing Bushing For All AEGs (oily)
Systema Silicon Piston Head With Bearing Suitable For All Models
SPRING GUIDE WITH BEARING for version 2

thank you
mateba