The one I posted a page back seems like it would have ultimate diffusion (why its a great combustion piece). Now im not buying it for medical reasons but really just to get strong effects and very smooth hits.
High diffusion generally means=/=flavor.....in your case I think worrying about flavor would be a much lower priority than getting more diffusion. With the cloud evo at low temps paired with a high diffusion piece and small hits seems like that would work well for you. Also having ice pinches allows you to try with and without ice to see what you prefer.
If you dont want to invert it you have two options either use silicone tubing (meh IMO) or buy a hydrotube ($$$). Why dont you want to invert?
For me personally not a fan of that angled downstem. Looks good other than that (although your putting some trust into that matrix perc, complex looking). I know TAG is getting their glass overseas but it seems like their glass is thicker as well as having some quality control and customer service and being US based. I looked at DHgate and found most reputable sellers are about ~$20 cheaper than TAG which is no biggie to me. Other sellers seem to have great deals but if the piece comes crappy then what? $ down the drain. A user just posted his review of the CCG and it was pretty negative.
EDIT: After looking on ioffer, dhgate I kept coming to the same piece. The can looks bigger than many other pieces. I love the colors (blue looks great, not a fan of green lol). And it seems like it is a great diffusion piece. That quality and features for 105 shipped seemed like a good deal to me
. Will keep you guys posted on my experiments