Hi Dierdrea, how is it going?
I would say without having thought so much about the why, this might very well be the reason you wont come ahead. I tried both: Using the regg stuff instant when its up (ofc no blackout right after vanish) to squeeze as much uses as possible - which pushed me to max force sometimes (i wont get even close when full madness). And trying to use it when i get low on force and would have to SS - which wont give you the most out of the talent.
Still not sure how you manage to outperform full madness, but i hope your logs will provide some insight.