Not with Marohi! That -attack speed is so crushing for smoothness. The best way to sunder is like this. You get yourself some Duelist or Marauder (literally any of the six ascendancies). You get yourself a nice rare 1H axe for your main hand and a stat stick - any base, but a scepter with elemental damage implicit is best, don't worry since Sunder will always only attack with main hand - with as much %phys added as extra ele as you can afford for your offhand. You grab some Haemophilia gloves, Belly of the Beast or Loreweave or a 6L astral plate with some phys taken as elemental, and Belt of the Deceiver for the single target damage.
You get Kaom's Roots with some attack and cast speed if killed recently and as much life as possible. You get some steel rings with life and poe items for trade, and an amulet with flat phys and %phys as extra ele. Other slots are as much life and resists as possible. You can get a hat with conc effect to put Warchief in if you want some extra single target, or not, it's fine without it. You get some jewels with as much attack speed as you can get. You get some Lion's Roar, Atziri's Promise, and if you can afford it, Taste of Hate. You use some Basalt if you can't get a Taste of Hate, it's okay. Your 6-link is Sunder - Multistrike - Melee Physical Damage - Maim - Chance to Bleed - Ruthless. You can use Conc instead of Ruthless for a bit more damage if you get some int on your gear, but you don't need to.
You get some Blood Rage and Arakaali pantheon with Arachnoxia captured from a Toxic Sewer map, and use cwdt + immocall to trigger it. You use Ancestral Warchief - Melee Physical Damage - Bloodlust - Ruthless for help with single target, and as before, you can use Conc instead of Ruthless if you can spare the int. I personally don't bother. You move around with Leap Slam - Bloodmagic - Faster Attacks - Fortify. As always with Leap Slam, remember to use numlock trick! Very important. You reserve mana with Herald of Ash and Hatred. Your tree takes Dervish and Ambidexterity by Duelist, and Slaughter and Cleaving and Strong Arm by Marauder for deeps. It takes Vitality Void for leech, and poe buy currency you're playing Slayer. And the rest of it is just life nodes. You get 235-250% life from the tree. And you leap slam around and bonk things and generally be immortal.