So it seems, before the Patch, Vivify energy spent did not coutn towards Flurry strikes energy spent.
Now it does but when you spam vivify on yourself while you have 10 flurry stacks and stacking up the energy spent, it just removes your flurry buffs when nothing is in range and resets on the 240 energy mark.
So basically after in like arena you port out to, spam vifvify behind a pillar, you will just completly dump your 10 flurry stacks into the void and reset the energy spent after the 240 mark. So your 10 stacks you build up and the energy buildup before just gets dumped with spamming vivify
Or in between Pulls you heal a bit you just lose the stacks in bad moments