I have to disagree. The post at the top of this guide states as follows:
You should try to maintain this buff as long as possible. Once you run out of shards to maintain the debuff, save up to 4 shards to repeat the process again
This is what I'm not getting. "Saving up" and waiting for soul shards means a massive dps loss, resulting from DPS of around 210-215k ish dps to drop down to the high 180s and stay there and never really increase.
Like I asked before, is there a certain haste or crit requirement I should be looking for to make this alot smoother?