If i am not mistaken, there is a dmg cap of 99,999 on anything, so even if your dmg is supose to be 200,000, it'll be capped at 99,999. to be honest, increasing the window option for SCs sounds viable since you need quite a bit to build it upto that point

Even if your fighting a strong mob, likely hood of it AoEing to disrupt your SC is quite high with something like paralyse or knock back depending on the mob