Spark Inquisitor for Mapping/Sanctum in GSF

I'm playing a Spark Inquisitor in a small private league. My goal is to build towards no-hit Sanctum runs.

I have been looking at cluster builds for achieving high speed & duration projectiles for clearing Sanctum around corners. Naturally this also requires clearing T14/16 maps. But my overall damage is very low, projected 360K DPS at level 90.

The top builds on PoeNinja are many millions of DPS, and they are all heavily aura-stacking. I'm trying to figure out what I can achieve in without access to lots of reservation clusters. I haven't been able to pinpoint where the core of their damage comes from. A bit from Nebulis, some from running RF. But nothing that increases damage by 10x.

Currently I just finished Act 10 and am level 70, but leveling very quickly in yellow maps. Here is my expected PoB at level 90, assuming no new gear is found. Any suggestions about ways to boost damage are appreciated, as well as reaching 100% crit for guaranteed freezing enemies in Sanctum.

https://pobb.in/A3SGSyXQWIfx

https://poe.ninja/pob/Snh

I already have a lvl 97 for farming (everything but uber-level) and can complete most other Sanctum challenge runs. I have plenty of harvest juice to reroll clusters for better notables. I have a bit of experience in crafting, and related experience farming Divines, Aisling, essences, etc.

Any input is appreciated, thanks!