KMST 1.2.450 - Evolving System, Adventurer Hyper Skills, Citadel of Tyrant

That amounts to 206,999,994 damage per 90secs or 2,299,999 damage per second, or 2.3 capped hits per sec. With the max range scenario, that amount reaches 2,999,998~ per sec, or about 3~ capped hits per sec.
Compared to Lightning Sphere, which maxes out at 90mil per 90 sec, or 1mil per sec, which is 1 capped hit per sec. Lets not forget that during that 9~ secs you spend on the skill, you won't have any additional dps due to channeling. It probably wins out at mob bosses like Empress I suppose.

On another note, does ignore pdr affect DoTs as well?

Nothing affects DoT except for max range. If my maxed range is 100k (sadly it is not though lol), MF's 700% DoT would be 700k each tick.