Ok, stop, here's the big important question: Why would the goal be to get TWF and THF close to each other? Why would anyone put in the bigger investment to get TWF if it not better than THF?
QFHTNOTH. (Quoted for hitting the nail on the head.)
The Brotherhood of BYOH--Thelanis: Charged, WF Artificer; Venomshade, Half-Elf Monk; Poxs, Fist of an Angry God; Crash, Pale Monkster