I cant remember the last time i saw a fighter TWF build posted. Most play strength tempest ranger for TWF for the healing and max DPS because of DOD and the capstone 25% offhand double strike.
If youre using heavy weapons then you need oversized two weapon fighting. Two weapon fighting min 15 dex with a +2 tome or higher to take improved two weapon fighting at level 6.
Cleaves only proc on the main hand weapon and arent good at all with TWF.
Aasimar is a good choice for healing hands, hamp and stacking vulnerability 20%. A lot of DPS builds also include falconry for the 30% helpless damage, 5% HP and 50% fortification bypass after flippin the bird aoe attack.
The target has to be made helpless before you can really ramp up the damage.
Max damage would be Strength because it stacks the highest and increases tactical DCs for stunning blow and trip. Could go wisdom from falconry attacks to create helplessness if youre soloing a lot.
Half Orc has another 20% helpless damage that stacks with falconry 30%, +4 hit damage, a guaranteed critical hit and a 40 Melee power action boost. Has no healing though.
Kensei 41
Aasimar 16 Fallen (really needs another 3+ racial points to max this build)
Falconry 23+
These are the best fighter feats for damage i believe.
Level 1 - Two Weapon Fighting, Oversized Two Weapon Fighting
Level 2 - Stunning Blow
Level 3 - Exotic Weapon Kopesh
Level 4 - Weapon Focus Slashing
Level 6 - Improved Two Weapon Fighting, Heavy Armor Training or Knights Training (To allow more weapon choices while leveling)
Level 8 - Improved Critical Slashing
Level 9 - Weapons Specialization Slashing
Level 10 - Greater Weapon Focus Slashing
Level 12 - Precision, Greater Two Weapon Fighting
Level 14 - Greater Weapons Specialization Slashing
Level 15 - Heavy Armor Chamption
Level 16 - Tactical Supremecy
Level 18 - Power Critical, Heavy Armor Master
Level 20 - Tactical Mastery
Level 21 - Overwhelming Critical
Level 24 - Two Handed Fighting
Level 26 - Perfect Two Weapon Fighting
Level 27 - Epic Damage Reduction
Level 28 - Elusive Target
Level 29 - Dire Charge
Level 30 - Blinding Speed, Scion of Arborea
Replace stunning Blow and Tactical Feats if youre going Wisdom based instead of Strength.
Run in Dreadnought but not sure about the best twists would be for this build.
Sense Weakness from Fury of the wild for another 30% helpless damage for sure.
Not sure what else. Someone else can help with that. Im on my first Epics run atm