By Phoenix.Kirana 2011-09-27 22:20:08
A little stp math:
Assuming Kannagi/Kamome and 50% dual wield for a base delay of 98 per hit, and assuming rajas, brutal, +5 stp kitty pants.
Base TP gain = 4.31666666
no iga back, no kakka (11 stp) = 4.7 = 22 hits
iga back, no kakka (16 stp) = 5.0 = 20 hits
no iga back, kakka (21 stp) = 5.2 = 20 hits
iga back, kakka (26 stp) = 5.4 = 19 hits
Worse case scenario, kakka still gets you to 100 tp 1 swing faster. If you are not using iga back, it gets you there 2 swings faster.
Edit: Essentially, it's not worth casting mid-fight, because you will lose more than 2 swings by casting it. No reason not to cast it before a fight, however.