When I was in 5/3 I went for :
- SoV berserker : Helmet, Shoudlers, Torso, Belt, Cloak
- Warlord : Gloves, Boots, Ring
- Weapon 1 : Gorebringer or Plunda
- Weapon 2 : Plunda or Gorebringer
Note that if you go for a double Gore or a double Plunda, the proc % won't stack, they'll be on their own for each weapon.
You can also modify this 5/3 to go for 4/3 like this, but you'll have to sacrifice Crit in benefit of Armor Pen. :
- SoV berserker : Helmet, Shoudlers, Torso, Belt
- Warlord : Gloves, Boots, Ring
- Beastlord : Cloak, Ring and Pocket
- Weapon 1 : Gorebringer or Plunda
- Weapon 2 : Plunda or Gorebringer
The second option is litterally a "Kan Opener" as you'll almost max out Armor Pen. through WS (don't forget to full WS with your RR and leave Crit aside) : like this.