So my preliminary new rotation is (starting with 3 ammo, 0 heat, all CDs):
Hypercharge
Hot Shot
Quick Reload
Split Shot
Barrel Stabilizer
Heated Slug
Reassemble, Wildfire
Heated Clean
Reload, Rapid Fire
Heated Split
Gauss Round
Heated Slug
Ricochet
Heated Split
Heated Clean
(wildfire proc)
Quick Reload
Heated Slug
continue normal 12132 rotation using Cooldown when heat hits 9x, CDs as they come up
If your rotation is unbroken you should always be at 60 or 65 heat when Quick Reload comes up, so you don't have to worry about going below 50. I'm not sure whether it's worth it to try to time overheat for Wildfire; right now I'm too annoyed by QR putting me below heat threshold to bother with intentional overloads, but I'm sure it'll be mathed out.