There's a couple of things. A lot, if not most, ele helix builds make use of big flat in a claw +added + an aura with trinity to get a huge dps boost. So your claw if even just say a low attack speed roll like 15% and a T4 or something lightning while running wrath would let you use a trinity support in your potential 5th link. Or you can find a gemini claw base and drop lifetap (except for pre-firing bosses before they spawn perhaps).
Mostly it's your claw. I made this claw real quick with VERY medium rolls and it was a 62% dps increase for you:
View attachment 411855
And damage on Spectral Helix in PoB is a little wonky. It's your average damage hit x your attack speed x NUMBER of hits (so on a boss at least two, maybe three) per skill cast. So your PoB says 47k but it's more like 100k-150k dps depending on mob positioning and body size.
Basically just get a better claw and stack flat elemental on it. Then hopefully work in Trinity and you'll be dandy. I've seen people do the entire game with a claw with T1 Flat lightning, T1 speed, and crafted flat cold. It's a very easy to work with ability.