Stackable bonuses consider this?

I remember back when I was training from 60 to 70 strength I used the berserker necklace and the obby mace (not maul) for a free 20% strength bonus. But now I'm asking myself while wearing my full mele void can it stack?

Before I test it or you accuse me of being wrong consider this:
Berserker necklace stacks with the black mask (unlike salve amulet)
Pest armor stacks with prayer/potions
I have never seen anyone try it
and the beloved google search never puts berserker necklace, obby, or pest control in the same sentence.

So what do you think?

Could it...
Give me the 20% final hit bonus - the 15% attack bonuses
and add my 10% 10% void armor to give me
10% strength and then 20% addition to my full hit and -5% attack bonus
(I'm pretty sure the 20% from the necklace is based on final hit not on strength bonus like prayers)
and void could also work with prayer/pots

which could leave me hitting 40+ with the mace (not much slower than d scim) with a weapon and necklace that only cost 700k?

sorry if this makes no sense.

 

well i know hitting 40s is possible cus i used no void piety super pots on tzhar kets and hit a 53 lol

 

im testing at yaks but so far i can hit 30's w/ or w/o the void

 

void is seeming to make no difference other than more often hits anyone have a house w/ dungeon and alter to help me out?