Enjoying my Half-Elf Kensai/AA

[Certon]

Until update 14, I couldn't make a full fledged Kensai/AA. Now, I've got a 13 Half-Elven Fighter (with Cleric dilly) with a blue bar and all the ranged feats other than SotR and IPS (Which I'm getting next level.) While I'm not as powerful as I had hoped, I'm enjoying the toughness of the build, and am looking forward to picking up TWF, ITWF, GTWF and IC:Slashing by level 20. Some questions though:

Question 1: I'm probably going to go Shiradi Champion ED, but I was wondering about Legendary Dreadnought and my two weapon fighting feats. Would it be better to abandon TWF and go power attack, cleave, and great cleave so that I can get the epic feat Devastating Critical and the Legendary Dreadnought ED Overwhelming Critical, or would that be a waste of time?

Question 2: Has anyone done this ahead of me? What are the pitfalls I should be aware of, other than people's hesitance to group with me at times, which I've experienced already? Any choices I should avoid (other than the obvious, give up?)