max
Out to lunch
I'll just paste the post I made in another thread the other day. I think the PD is as efficient as they come because of the physical design of the vape and the way most of us tend to take hits.
From my experience with the V-Tower, the Cyclone bowl design works against efficiency as far as getting all the herb exposed to the vapor path. I'd hit it and the herb would move around in the bowl. How much it moved depended on how much was loaded, how finely ground, how dry, and how hard I hit it. At worst, the particles would fly around and maybe avoid the hottest part of the vapor path-at least part of the time they were in the outer, cooler part of the bowl. If I raised the temp to compensate, it didn't really help, since higher temps roast the herb faster, thus inefficiency occurs. The answer is to just keep hitting it until all the herb particles are fully exposed to the hot vapor path. You have to do the same with the SSV. Although the herb stays put in that bowl, the vapor path is narrow, requiring stirring of the bowl to get it all exposed. So although both vapes are inefficient to some extent as far as requiring multiple hits, what if you either narrowed the bowl or widened the vapor path so that all the herb got vaporized in one or two hits? If there was a large amount in the bowl, you'd get a ton of vapor per hit, then inefficiency would kick in on the human side-you'd get more vapor than you could hold and process. You'd have to load less in the bowl or take smaller hits.
I've thought about some kind of bowl add-on (or add-in) for the Surfer bowl, to keep more of the herb in the vapor path. Seems like narrowing the bowl is the best answer for fewer hits per bowl on any vape, but if you don't compensate by loading less and/or taking smaller hits, it can be counter productive. That's where the PD shines-narrow vapor path but it covers the whole bowl, and a small amount for easier processing (the human factor).
If I were going to change the Extreme bowl setup for better efficiency as far as number of hits required, I'd narrow the bowl to keep more of the herb in the hot air. I'd do the same with the SSV or any other full size whip vape. You'd still have to adjust for smaller load and/or smaller hit, but that would be my choice. And some method of keeping the herb from flying up to the elbow connector would be nice too.
I think you can look at efficiency in different ways. There's the human factor, as far as taking bigger hits than you can efficiently process. Getting the most vapor per draw is one way. Getting all the herb in the bowl vaped is another. Condensation loss is another, and that one mostly depends on the vape design, although you can shorten tubing (if that's a part of the particular model), keep glass and tubing cleaner, etc.
From my experience with the V-Tower, the Cyclone bowl design works against efficiency as far as getting all the herb exposed to the vapor path. I'd hit it and the herb would move around in the bowl. How much it moved depended on how much was loaded, how finely ground, how dry, and how hard I hit it. At worst, the particles would fly around and maybe avoid the hottest part of the vapor path-at least part of the time they were in the outer, cooler part of the bowl. If I raised the temp to compensate, it didn't really help, since higher temps roast the herb faster, thus inefficiency occurs. The answer is to just keep hitting it until all the herb particles are fully exposed to the hot vapor path. You have to do the same with the SSV. Although the herb stays put in that bowl, the vapor path is narrow, requiring stirring of the bowl to get it all exposed. So although both vapes are inefficient to some extent as far as requiring multiple hits, what if you either narrowed the bowl or widened the vapor path so that all the herb got vaporized in one or two hits? If there was a large amount in the bowl, you'd get a ton of vapor per hit, then inefficiency would kick in on the human side-you'd get more vapor than you could hold and process. You'd have to load less in the bowl or take smaller hits.
I've thought about some kind of bowl add-on (or add-in) for the Surfer bowl, to keep more of the herb in the vapor path. Seems like narrowing the bowl is the best answer for fewer hits per bowl on any vape, but if you don't compensate by loading less and/or taking smaller hits, it can be counter productive. That's where the PD shines-narrow vapor path but it covers the whole bowl, and a small amount for easier processing (the human factor).
If I were going to change the Extreme bowl setup for better efficiency as far as number of hits required, I'd narrow the bowl to keep more of the herb in the hot air. I'd do the same with the SSV or any other full size whip vape. You'd still have to adjust for smaller load and/or smaller hit, but that would be my choice. And some method of keeping the herb from flying up to the elbow connector would be nice too.
. It may work better if the bowl bulges out a little and then gets skinny again at the top (same as the bottom if possible--may need to use a screen or tight ice dimples/glass screen). Also (just in case you didn't do it already), make sure to let the bowl warm until HOT. Just my 
(good luck & have fun playing around 
).
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