Why is Lee sin rewarded such damage from hitting his "Resonating Strike" at such short range?

^^^^^ Why is he rewarded such damage? he uses energy he has no mana, "(+ 90% bonus AD) (+ 8% of target's missing health)" <--- like wtf

It needs to deal less damage if he hits resonating strike in your face and the % of missing health needs to SCALE through level. I suggest having it scale very low to a little bit higher than 8% when maxed and for compensation lower the bonus AD ratio to 70%. Like its 99/100 he hits it, even if you FLASH it will still hit you! Ive even him in situations and STILL he ends up killing me like wheres the counter play riot games?