The best way to maximize this build would be to take the following feats. Double Slice, Greater Weapon Focus, Improved Critical, Improved Two Weapon Fighting, Piranha Strike, Slashing Grace, Two Weapon Fighting, Two Weapon Grace, Weapon Finesse, Weapon Focus, Weapon Specialization. For Weapon Training take Light Blades, and Focused Weapon. This will take all your feats and weapon trainings.
This will still not match a two-handed fighter using a falchion with half the feats and weapon trainings. The fighter with Greater Weapon Focus, Improved Critical, Power Attack, Weapon Focus, Weapon Specialization and Weapon Training Heavy Blades will have a DPR of 45 vs an AC 19. The fighter using two Kukris will have a DPR of 43.35. That might seem fairly close but the fighter using the falchion still has 6 feats left to spend. When I start adding things like Furious Focus, Cornugun Smash and Hurtful to the Falchion wielding fighter his damage goes up much higher
The above numbers do not take into account magic weapons or other factors. It still gives you an idea of what the build is capable of.
Weapon Master means you don't get Focused Weapon. That actually lowers your DPR to 38.25.
For TWF with kukris, you want to have more attacks (Improved Two Weapon Fighting) and more critical hits (Improved Critical [Kukri]).
Critical Focus is also a good idea at 9th or 10th level in and of itself, but also to set up Bleeding Critical at 11th level.
Two Weapon Rend is mathematically better than Greater Two Weapon Fighting, so you may want Double Slice.
You will want both double slice and two weapon grace. Two weapon grace allows you to use DEX to damage while using two weapon fighting, but you only get half you DEX bonus to damage with the offhand weapon. Double slice allows you to get the full DEX to damage with both weapons.
The only bonus to damage two weapon rend will give you is 1d10 + 1.5 DEX bonus. It will not gain the bonus damage from other feats or bonuses like weapon enchantments. You also cannot get a critical hit with it or trigger feats or enchantments from a critical hit. This also assumes you hit with both weapons.
Two Weapon Rend is mathematically more likely to trigger when you are attacking three times with the primary weapon and twice with the secondary weapon than hitting on a third attack with the secondary weapon at -10.
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The best way to maximize this build would be to take the following feats. Double Slice, Greater Weapon Focus, Improved Critical, Improved Two Weapon Fighting, Piranha Strike, Slashing Grace, Two Weapon Fighting, Two Weapon Grace, Weapon Finesse, Weapon Focus, Weapon Specialization. For Weapon Training take Light Blades, and Focused Weapon. This will take all your feats and weapon trainings.
Weapon Master means you don't get Focused Weapon. That actually lowers your DPR to 38.25.
what if we did weapon master, drop double slice, slashing grace, and two weapon grace, grabbing focus weapon and trained grace weapon trainings with the feats?
also, a Sash of the War Champion seems a must for this build
My build already includes focused weapon. At 9th level he is has a +2 for weapon training bonus, using Trained Grace would increase that by 2 but would mean he does not get the DEX to damage. My figures assumed an 18 DEX which means the bonus would be identical. My build also did not factor in the stat increases for 4th and 8th level or a belt of dexterity. Once those are factored in the DEX to damage will be greater than trained grace.
I also did not factor in any magic items. A mithral breastplate is fairly cheap but mythral full plate costs a lot more. At this level I am not sure the extra cost for full mithral full plate, and a sash of the war champions is worth it. Don’t forget you need to buy two magic weapons and will want to probably a good belt of DEX. You will also want to have enough for the rest of the big 6. If you go with a +2 mithral breastplate and a +4 Belt of DEX it will cost 24,200 gold. +2 Mithral full plate and a slash of the war champion will go for 18,500 gold without a belt. The belt not only increases your AC it also boosts your chance to hit, damage, and reflex saves. The mithral breastplate will have a max DEX bonus of +7 at 9th level.
As long as you keep armor training you can put off purchasing the slash of the war champion until higher level. The difference between full plate and a breastplate is only 3 points. The breastplate will give you a slightly better touch AC which can be important.
Weapon Master also loses Armor Training so a slash of the war champion will be worthless with that archetype.