For Matthew (from Facebook thread):
***
Personal Combat Style: Crow’s Claw
Prerequisites: Strength 15 or higher
Maneuver and Technique DC: 8 + your Strength modifier + your proficiency bonus.
Weapons: The Crows’ Claw style uses two War Picks.
Journeyman
Unbalancing Attack (Maneuver): pg.245
Deadly Strike (Technique): pg.244
Balanced Hands (Technique): pg.246
Master
Precision Strike (Maneuver): pg.244
Blood for Steel (Technique): pg.243
***
At Str16, Fury4 (Spirit of Savagery) you would get:
AC: 10+Dex+Con (Foes have Advantage)
Attack Action: +3 (Advantage), 1d8+Str+2+4
Bonus Action: +5 (Advantage), 1d8+Str+2
For the lost opportunity costs by going Spirit of Savagery, you could actually do better without trying to TWF.