Honestly I don't think the type of concentrate plays much of a difference. I ran everything in my first one and only the finest stuff I could find in the second but they both suffered similar performance declines after about 3 grams.
How long do you hold the power on for? Do you load when it's hot or only when it's cold?
Joe,
It appears you may need to do the 20-20 burn after your next cleaning.
What happens with alot of these concentrates, even the purest of them, the impurities collect at the coil as the good essential oils get vaporized off. The thing about our core design is that your able to burn off the impurities without burning any fiberglass or other plastics.
Weather i do a 20-20 right after a cleaning or before the cleaning i always make sure to do it while the core is fairly dry and doesn't have much concentrate in it, the concentrates acts as a cooling agent and wont let the coil get as hot as it needs to be to clean off the impurities.
When the core is ready i start with shorter cycles of about 10 seconds on, 10 seconds off for about 5 times. Then step up to the 20 seconds on, 20 seconds off for another 10 cycles. You will notice its working when alot of foul tasting vapor/smoke starts coming out of the core. (Do not inhale this, it is the vapor from the impurities and will NOT taste good. After a few good cycles let it cool off and do one last ISO soak and a 10 min boil in water to get rid of any lingering impurities.
Cheers,
Tim