50k is ridiculously low for Lightning arrow... I reckon you didnt use HOWA, didnt get T8/9 flat/cold/light dmg rings and probably need to respec skill points.
Do you have mana issues also? Sounds like you spent a fair amount on bow with +proj skills and even with mana Jewel/MPK fixes it may be a problem.
Temporalis blinkers - unless if you spend 1000 DIV on build, youll be squishy i think. I tried and didnt like it.
ive got flat cold+phys on one ring, t7+
and the other one with some cold flat
I am also using HOWA
I use unique flask mana one, so its not an actual issue, only when there are not many monsters around maybe