@fernand: I'll try to grab some "loaded" Joye atty pics tomorrow (no promises). I load anywhere between one wooden-match-head size to two or three wooden-match-head "pieces" (or drips or whatevers). Or something like that. I don't bother to weigh it.
Once what-ever-form-it-was-before has melted down to oil, it can easily cover the entire ceramic cup and wick and coil (and the metal mesh around the cup) by 3-4mm. So for me, one "travel" load is about 3-4mm of melted down wax/shatter/goop/whatever. That's height in the atty above the top of the ceramic cup. No relation to weight at all, but all I can give you now. The whatever-it-was-to-begin-with sitting right above the coil turns into oil right away, and after three or so hits, whatever-it-was is now mostly all oil. Sometimes if I want a really full load, I'll load the atty, then take a few hits to melt everything down, and then I'll top it off with a little more whatever.
A fully loaded Joye (that has melted oil that's 3-4mm above the coil) will not have any airflow, as the oil is completely covering everything, sealing off the bottom of the atty. Firing the battery for one second before taking a hit vaporizes an air path right above and below the coil, and you get a great first hit. Until you put the atty down, the oil does NOT reclog the airpath, so you can take as many hits at whatever pace you want, and you don't have to pre-fire the battery. When you finally put the atty down for a while, it will probably reclog the airpath, until you've done 3/4 of the oil you loaded. If you suck and get no airflow, just keep holding the battery button down for one second and all will work again. I get dozens and dozens of hits before I have to even think about reloading. I get zero leaks.
There is some effort involved in this though. Nothing very complicated. After you've vaped the first third of your 3-4mm load, you should probably take off the drip tip and heat the drip tip end of the atty with a lighter for a few seconds so that the vapor that has condensed back to oil on the insides of the atty shell between the ceramic cup and the drip tip will drain back down the sides toward the cup/coil/wick. Nothing profound, no torch needed, just a lighter,
and only heat the atty a little at the top, just enough to heat the shell enough so that the oil drains back down. If you start to get a wisp of vapor smoke while you're doing this, you're heating the atty shell to much. Takes all of 10 seconds.
After you've vaped another third (so you've vaped two thirds of your 3-4mm load), it pays to have a little tool. You repeat the procedure you did for the first third, melting the oil on the insides of the atty shell back down, and then you take a tool that's shaped like a thick needle with a very rounded (not pointed) end. I use either a 2mm thick SS darning like needle that's 7cm long and has 3cm of cloth gaffer's tape around the end with the hole for the thread, so I don't burn my fingers if I decide to heat up the tool. Or I use a 3mm thick titanium gizmo with about the same dimensions made for this kind of thing. Anyway, once the oil level is low enough so that the top of the cup and coil are visible, it sometimes nice to help the oil that's hanging around on top of the metal mesh surrounding the ceramic core, and the top edges of the ceramic core. We don't generally keep taking hits one after the other for minutes on end, so we never really heat up the ceramic core itself anywhere near hot enough to vaporize oil. That all happens on and within a half mm of the coil (inside the ceramic cup). So when the oil starts to get low, heat up the poker a little and run it around the bottom inside edge of the atty shell. The very blunt and rounded tip of the tool you're using should be sitting on top of the metal surround mesh while you're rotating the atty, so that all the nice oil gets pushed into the ceramic cup and on top of the wick. I've been doing this for weeks and weeks, and I haven't damaged the coil or the core or the wick. And I'm
always stoned when I do it. I'm still on my first two Joye atty's as well, and I haven't had any need to clean them either.
Oh, and don't forget to get the condensed oil from inside the drip tip too...
Oh, and when you start a fresh atty, drop a small glob of concentrate on top of the coil, just big enough to cover the coil and wick and the edges of the ceramic cup. Then (without putting the drip tip on), just give one second pulses on the battery every few seconds until the concentrate turns to liquid (oil), and soaks into the new wick and insides of the ceramic cup. If the rising vapor starts to obscure your view of the coil, just blow into the top of the atty to disperse the vapor. Don't be in a rush, give the concentrate time to turn to oil and saturate the wick/coil/cup. You only have to do this once, when the atty is new. And don't try to get greedy and inhale the vape while you're conditioning the wick; you'll burn your mouth. (Don't ask me how I know). Once you've conditioned the virgin wick, put a normal load in. And there's no way you'll "waste" a gram of concentrate "priming" the atty and its mesh. The amount of concentrate "priming" the atty is very very small.