Damnit, last post just couldn't be shaved down to under 10k characters.... necessary rare triple post! I'd definitely agree with you on that last part..rosin (or bho like shatter) is not well suited at all for tanks / cartridges. If you live out in the cuts, in a non-legal jurisdiction, and must grow / make your own stuff, and you also insist on putting it in a tank, well, I can see why people jump through all these hoops and make these compromises. But if you don't have an irrational fear of solvents, or "processed" concentrates, or if you do have access to stuff like co2, distillate and HTFSE, why bother with rosin on a tank? On most tank gear, this is a problem, which is largely why I don't recommend rosin for tanks... BUT.... It's not "on the market" so to speak, just yet, but I'm hoping that can change coming up next year for 2018... but I've been vaping on these for over a year now. It's a few pages back, you might have missed it. After vaping about 3 grams on one of these donut coils, I wanted to switch to a different coil to test, so I intentionally let the oil level get down low, as low as it can while giving puffs, before I pulled it apart to soak and clean, and with a burn-off of the donuts and soaking, everything came out about 99% as pearly as before. This cleaning cycle can be repeated many times probably, (but exercise the most caution during the donut burn-off, and don't contact the wires, they're brittle) It's also somewhat wasteful, with the reclaim, so it's best to do several refills before a cleaning. How clean your input material is will determine how long you can go before it needs to be cleaned. And note the large wicking holes in the atomizer coil case...this makes thick co2 oils and rosins feed into the coil, no problem.