Finally, although not by the best circumstances, I had a chance to go to an HNM on SAM.
It was crazy...
http://img151.imageshack.us/img151/967/img0898kq1.png
Top is the highest Kaiten without a DA, middle is the highest Gekko without a DA, and the last is the only DA WS I landed. Overall Kaiten loses out to Gekko/Kasha/Yuki by about 300-400 damage on him with 300% TP, but it's still pretty strong considering Kaiten only needs 100%. TA WS showed just about the same results as well.
With SA the range of Kaiten was about 650 to 950 damage with an average of about 750, and the other WS had a range of about 900 to 1300 with an average of 1k. With TA Kaiten had a range of 250 to 400 with an average of 300, and the other WS had a range of about 300 to 650 with an average of 500.