Thief %/s (KMS Unlimited and GMS Tempest)

I don't understand how you can get higher %/s doing the final hit when its inherent dps is lower than the first 3.

Final hit: 740% * 2.5 * 1.35(crit) / .72s = 3468.75%/s

First 3 hits: 740% * 2.5 * 3 hits / (1.17s + .24s) = 3936.17%/s

Didn't count shadow partner but it doesn't matter. And if dark sight only adds 120ms as I suspect it might, then just even more so.