PoE 3.21 Crucible Marauder, Tectonic Slam, Melee builds

Hi folks, I found a Redblade with the mod 1% increased attack damage per 450 armour for Tectonic Slam. I also have a shield with 1% attack damage per 750 Armour. I was very intrigued by the idea so I levelled a character and winged it to lvl 93. The gear is negligible it was just to be functional and feel out the skill. The clear is lovely, single target and dps scaling not so much. I'm really curious if this can work out, but I'm not sure how to properly scale it. Should I ditch half the tree and go regular armour/aura scaling clusters? PoB so you can see the rough idea: