Mch needs more

[CKNovel]

Ah. Gotcha gotcha.
I didn't realize there was a term for this trick, thank you~

But what's this about it being the "lowest priority AoE?"
I didn't realize moves had priority. What do you mean by this?

Here are the per-second values:

Bioblaster: 360p / 2.5s = 144p/s
Autocrossbow: 180p / 1.5s = 120p/s
Flamethrower: 100p/s (Flamethrower ticks 1tick/s instead of the usual 1tick/3s)
Spread Shot: 180p /2.5s = 72p/s

Heat doesn't affect AoE actions, so you only have to worry about Autocrossbow being on a minimal GCD.

The gentleman above is right about the calculations.
Flamethrower is the lowest aoe cooldown, I forgot to mention that important information, my bad. Spreadshot is to use when nothing else is available.

One more thing if you want to try to be a math warrior:
Spreadshot generate 5 heat (around 2.5pps) and Flamethrower interrupts auto-attack, worth of ~60 potency.

If Shotgun is Spreadshot+, remains 10 heat and rise the potency to ~200+ there is a fair chance it surpass Flamethrower.
It sounds counter productive but I'm praying really hard this happens.