Hi, after reading up a bit on this atomizer/coil head, it should indeed handle higher wattage and the 70 VG/30 PG ratio mixture, although I would have immediately guessed that’s what’s causing it…
Perhaps chain vaping, improper priming of the atomizer/coil head when you first use it, or if the liquid level in the tank is very low can also cause a dry hit… but you’ve surely thought about these already.
Maybe try again with 50/50…
I don’t think a different flavor would cause this, especially since flavors are mostly PG-based…