Boneshatter SSF: Gear Swaps for Sanctum?

I'm just pushing into Yellow Maps as an Axe Boneshatter Juggernaut, playing SSF. I'm doing fine in my maps (240K DPS and very tanky) although my gear has a long way to go. No Six-Links yet.

What I'm trying to do is to increase my viability in Sanctum. I have increased my melee strike range as much as possible, and I'm working on upping my attack speed and average hit. Does anyone have experience trying this approach? I suspect a more end-game sanctum build will do Maces and stuns, but this is where I am right now.

In the interim, I'm considering having some gear to swap out when I'm about to start a new floor and have 8 rooms saved up. I'd grab flat damage and attack speed. I'd sacrifice HP, resists, and armour to get it.

Any ideas and input are appreciated. SSF and still building my gear library, so gearing options are fairly limited so far. I'm on Controller (PC), so some things are more difficult.

PoB: https://pastebin.com/ZJEzdcNk