Static Strike Shockwave Slayer

Hey peops!

So I wanted to try out a attack based staff character, due to all the crit and crit multi notes and decided to go for a Static Strike Slayer.

Correct me if I´m wrong:
1. Static Strike don`t need a lot attack speed, because u can`t scale the beams frequence. Its a nice to have secondary stat for quality of life, because your attack animation becomes faster. (less interrupting from stuns, chills, freezes)
2. I use Shockwave Support over Ancestral Call, because the dmg from 3 beams is lower compared to the dmg from 1 beam and a shockwave and Ancestral Call doesn`t scale shockwave.

Questions:
1. How do i scale my end game? Attack speed isn`t that good, because it only scales the melee hits.
2. Add x to y damage isnt that good due to the low hit rate or does it also scale the beams and shockwave?

Here is my POB: https://pastebin.com/ihqpXCR7

PS: I use Carcass Jack because i have it 6 linked. The AOE and AOE dmg only scales the beams range and shockwave.