Nice, reminds me of when I brewed hopinator

I have my propane tank a little bit closer to my burner than you, so a LITTLE residual heat transfers that way. It also helps that its in a smaller area so the wind doesn't get to it. Its also in full sunlight, which in AZ might as well be a bottle blanket for metallic objects
Also, even if you mash at 1.25qt/lbs, a little bit of fermcap does wonders to making those dough balls break up! Seriously is there anything fermcap doesn't improve related to brewing?
Improves starters - no boilovers and lower krauzen buildup
Improves mash by helping brewing salt dissolving as well as breaking of dough balls
Improves boiling by reducing hop oil loss (improved hop utilization) / protein expulsion and no boilovers
Improves fermentation by less expulsion taste and head retaining proteins