So are you saying that when you look at it now with a flashlight at ~400F, you see absolutely 0 mystery vapor? Don't believe the "resin" copout. If it offgasses the same on a brand new empty tank for 25 cycles. It is safe to conclude it is permanently off-gassing. Vaporzing doesn't actually produce much resin at all, and any that it possibly could would go away very quickly doing dry burns.