Here is my fighter spec'd for damage. This was on hard, level 12 now, not finished yet with game. This is my first playthrough.
Damage Spec'd Fighter
Can tank well enough to stand in the fray and beat down the enemy with minimal babysitting required
Race = Boreal Dwarf - dwarves are cool and +15 accuracy to two of the more common enemies is not inconsequential
Culture = Deadfire archipelago - for the +1 to dex
Might = 20 - a high might helps damage, scroll use, and the fighterpassive endurance regen
Con = 9 - high enough
Dex = 18 - faster is better, more actions make for more damage
Per = 10 - no malus, but no bonus. wanted the concentration more than the interrupt
Int = 3 - fighter's don't have much for duration abilities so no big harm. Knockdown lasts for 3.3 sec instead of 5 sec
Res = 18 - balances the bad will save from the intellect dump, gives good dialogue, gives good concentration
Talents/Abilities (in order taken)
1.) Disciplined barrage - a +10 accuracy helps to get hits or more crits, doesn't last long. Replace with two knockdowns if you prefer. I like it as it is a one click at the start of every battle, many times I forget to use all or some of my knockdowns
2.) Weapon focus - +6 accuracy is nice, especially at low levels, I went with Adventurer
3.) Defender - modal ability adds deflection and two more engagements at the cost of 0.8 attack speed. You can turn it off when not needed.
4.) Wary Defender - makes defender better with +15 deflection, +10 reflex, will and fortitude saves
5.)Weapon specialization - adds +15% damage to all the weapons in your weapon group. Makes you flexible in that your ranged, one hand and two handed all get better.
6.) Weapon Style - I went with two handed for the +15% damage, dual wield would also suffice here
7.)Armored Grace - reduces armor speed reduction by 16%, makes plate as fast as scale. This makes your actions faster, faster means more damage output.
8.) Weapon Mastery - another +10% damage to your weapon group for a total of +25% that only fighters can get
9.) Critical Defense - reduces 20% of incoming crits to hits and 10% of hits to grazes. Since your deflection is not maxed, you will get hit and this will lessen the blow. Not sure if it works for spells as well
10.) Your choice - I went with Superior Deflection - +5 deflection not super but the choices were not that great. Take whatever suits you here.
11.) Unbroken - a self res to 50% endurance that also gives you +5 DR, +10 deflection and +10 saves - if you need it this is a great ability
12.) Your choice - I went with Rapid Recovery - +1 End regen modified by your might, adds to your Constant Recovery ability, again not super but the choices were not that great. Take whatever suits you here.
The team and their damages are:
PC two hander Estoc/Warbow - 92K damage with 8 KO
Eder Sabre & Shield/ Pistol - 35K damage with 10 KO
Aloth - 36K with 13 KO
Durance - 19K with 11 KO
Grieving Mother (replaced Kana at level 9) - 15K with 5 KO
Sagani - around 25 K, maybe 8-10 KO her stats got reset.
With this spec a fighter is not a meat shield agro bot but a true tank like the Sherman tank in Fury. An ass kicker in full plate packing steel.