Don’t give up on Squirts.
Make sure to equip Guardian’s Path passive and I’m sure Mantra of Salvation:Agility is already on the skill bar.
Even if you have 0% Squirts uptime, you are going to get double damage for 2 minutes with a Shield Pylon and likely double damage on a few rift Guardians.
When you spread this benefit over 15 minutes, you’ll realize nothing else is quite as good.
Because we are comparing Squirts to Hellfire, assume the best damage passive gives 20% multiplicative damage You pick this and your 15:00 top-end push drops down to 12:30.
Compared to Squirts, you are automatically going to earn 2 minutes of progress on a Shield Pylon, possibly more because you will play aggressively. If the rift guardian takes 3 minutes, you just cut that in half and your clear is now 11:30, which is 1 minute faster than Hellfire — provided Squirts doesn’t kill you.
With good elites affixes and meleeing trash mobs, expect some Squirts uptime throughout the rift.
Hopefully this perspective on Squirts keeps you on the right track.