Taking a large step forward in ideal extraction seems to require a wholistic approach, involving even the plant genetics and lifecycle.@Farid Sounds like we are on the same page here. And yes, unless I'm using a tiny quantity, it has not really been possible to reach absolute complete extraction. When you have multiple calyx/leaves in the chamber, it's damn near impossible to avoid covering trichomes with plant material.
I think it comes down to physics, and all other factors equal, the real limiter is chamber diameter.
With portables the relatively small chamber diameter doesn't allow you to pack a decent amount of material into the chamber in a shallow single layer... you need to pack it deeper. With a deeper pack, you have more buried trichomes, and trying to selectively heat the trichomes with a quick application of high heat will result in the top layer being overheated while the bottom layers are under-extracted.
With desktops, I think you've got a much better shot at full extraction in a single hit because you can pack a very shallow chamber. So long as the heat is even over the entire diameter of the chamber, you'll get better results compared to using a smaller diameter chamber.
@RustyOldNail and @Stu , I've tried the whole nug method as well, and while it does produce great results on the first hit, I do find that there are so many hidden trichomes inside of the nug that the only way to fully extract them is to break up the nug half way through a session. If you like the experience of whole nug vaping, I'll say that the experience of vaping pulled apart nugs is even better. It's the same great taste, but greater vapor density, and no need to break up the nug mid session.
@KeroZen Oh, yeah! I totally agree with the "sucking on a hair drier" analogy. If the load is so loose that material is able to blow around in the chamber, the vapor density drops off in a drastic way.
I seem to remember you like to tease out your chambers for like....some ungodly amount of hits, hahah. In that case, a denser pack and finer grind are totally viable. And actually, I really do enjoy a session of medium grind, lightly tamped. It's great.
I will note that with the selective trichome vaping technique that I'm experimenting with, I've been getting super dense hits. So I am not just getting wispy-but-tasty hits here. Like you, I don't like wispy hits at all. I'm shooting for as dense as possible.
@cannasoor, HAHA! Dude.... you're not far off.
* dense flower may be counterproductive to fast loose-convection extraction. Look for high trichome yields on lower-density flowers
* great hash plants might be great convection flowers, but only to an extent. Look for long trichome stocks, but expect higher trichomes loss on flowers that wash well (glands that separate from stocks very easily).
* perhaps there's some benefit to *slightly* earlier harvests when resin glands are more firmly attached to stocks?
* gentle treatment through harvest and processing is key. Load a stem from flower/leaves pulled directly from a cured branch - bypass all the losses incurred through typical processing for retail.