Feedback on my Lightning Strike build

Hey guys,

I´ve managed to push my Lightning Strike build to almost 2M shaper dmg and did 5 way legion battles / shaper, etc.
Everything is working out and this character is just wrecking maps in seconds. However, I am struggling to push it any further. I´m trying to find ways to improve the build and dish out more dmg. I´d appreciate it if you guys could take a look and suggest some improvements I should try: https://pastebin.com/CE0eAmr9

As it stands, the build can do shaper in seconds but 5 way legion battles are a bit slower. The only improvement I can think of is getting a Head Hunter but that´s gonna take some time. So any and all improvement ideas would be greatly appreciated.

Thanks in advance!