Surfcaster Ice Shot of Pen Inpulsa's Leaguestarter

The current PoB: https://pobb.in/J5Ulrp6GUzxT

Here's my Phrecia Leaguestarter. It's a fork of aer0's Deadeye Ice Shot of Penetration. (https://www.youtube.com/watch?v=iCWMHktt9qI)

Why Ice Shot of Penetration for Surfcaster? I like the idea of free Inpulsa's engine and wanted a skill that also takes full advantage of Glacial Wave.

Strengths:

"Ghost of the Deep" - Duh.

"Stormy Seas" - Converts our Lightning Damage from bow to cold and allows our cold to shock for bigger shocks. Ideally you'd go triple phys and cold convert mastery for 100% phys to cold. Defeats the purpose of the first line but oh well.

"Within the Tempest" - Fuels our Herald of Ice + Inpulsa's combo, creating some super juicy explody chains.

"Glacial Wave" - Ice Shot chills enemies as though dealing 195% more damage at Level 20. This should give maximum uptime on Glacial Wave's maximum effect (at 30% chill: 15% reduced damage dealt by enemies and 30% increased damage taken). This is helpful for tankier mobs.

Coziness: One-button build. Throw mines, move, throw more mines. You can see this in aer0's video.

Weaknesses:

You are paper. Chills/freezes/off-screening is your main defense.

Degens. Vitality aura and life flask are your only defenses against degens.

zdps bossing until some actual investment.

"Why not self-chill?" That's an extra button. I'm lazy. If you really wanted self-chill, you'd probably replace torment.

"Why not HoT?" It's a possibility if this build walls early or I get bored of this playstyle.

Please critique and let me know if I'm misunderstanding some interactions/mechanics or missing some obvious damage/defenses. Big thanks to aer0 for the original build!