I need suggestions of what modules and torsos to use, here are the ones i have:

Torsos: Spider, Ultraspade, ultra guardian, galaxus model a, galaxus model b

What im using:
Physical:
Galaxus model A
Armor plating 10 x2
Bullet storage 10
Heat n Energy 12 x2
Ultra resistance module

Energy:
Ultraspade
Bullet storage 8
Energy n Heat 12 x2
Energy module 8 x2

Heat:
Spider
Armor plating 10 x2
Energy n Heat 10 x2
Energy n Heat 12 x2

With your electric mech withe the Ultra Spade, You dont need a shotgun.
If anything you want something that drains ALLOT of energy.
And your using both heat and Energy moduels, Why dont you just use a "Regeneration & Cooldown Module 5" They are allot better.