It seems that the reuse timer on Tsunami is 1 Min 30 Seconds regardless of whether or not I spec into this AA. Currently have 5 AAs spent on this and the tooltip says it should reduce the cooldown by 40 seconds. Anyone else noticing this?
that is the 40 secs from the reuse, not the Base reuse. it adds into the up to 50% of the base reuse time at 100% reuse.