How Does Beguiler Calculate Focus Hit Bonus

[nem0]

I can not seem to get the numbers to add up in testing. Even if AoE spells only count main targets hits I am coming up with weird numbers. Does being resistant(even though being hit) to affliction remove bonus trigger? I am hitting groups(6+) of enemies already afflicted by at least phantom foes(flanked) and at best I am getting in the 30s for Focus generation when my tool tip suggests +14 Focus on hit with deception spells. I also have complete self(+5 on crit with spells) and when I register 6 crits against foes with flanked I regained 22 focus. 

I don't know if the description is misleading or this is bug.