Best item combo for elemental PRM in AoM?

Grim Dawn Classes, Skills and Builds
1

The question is really about Mythical Invoker’s set (From perspective of Inquisitor + Arcanist).

http://www.grimtools.com/db/itemsets/90

Pretty great set of bonuses. Thing is, I feel that the rings are pretty weak, the amulet has some serious competition with a crafted Heart of Malmouth:

http://www.grimtools.com/db/items/7568

… And Invoker’s Blaze, probably the best piece for PRM in the set, especially when combo’d with one of those two:

http://www.grimtools.com/db/items/9379

http://www.grimtools.com/db/items/9323

Those two bring up a curious point if it would be better to dual wield those instead.

Also brings up a curious point of this helmet:

http://www.grimtools.com/db/items/8128

Any value to combining it with dual weild of those pistols for 48% weapon damage to PRM?

Or even equipping that helmet with a big ass elemental friendly two hander?