I've been starting to build dual coils on the RM3, always built a single 1.2 Ω. I've noticed the RM3 gets extremely hot at even a 0.6 ~ 0.8 Ω. Searching through here, I've been reading that a 3-post dual coil RM3 comes with 2 airholes, but the 2 I've owned only have ever had a single airhole...