The reason they are heating up is that the coils aren't mesh i would imagine. Sorry if they are and you have already said this.
but the older style coil now sometimes had issues with heat dissipation so it retained heat with chain vaping and potentially cracked the glass on the tank.
With the falcon (great choice btw), the M1 coil which is by far the best does not have that issue, nor does any other mesh coil i have tried. As you know i have tried a LOT of mesh tanks over the past 6 months haha
Even the Crown 4 tank, the standard coils in the box did warm up chain vaping, whereas the mesh i bought to try for review didn't have that issue.
Falcon and M1 coil is fantastic for chain vaping.
Oh and the Drag 2 is brilliant for warm tanks. I accidentally fired the alpha in my pocket a while back on the drag 2 because i hadn't locked it rushing for a bus. The mod didnt heat up at all despite the tank on top being hotter than the sun haha