Hoptimum I'm not sure you understand me. I'm not necessarily talking about vapor I'm exhaling (although that too), but also vapor in the bong while milking. The actives are visible, so while the low temp actives are still activated at temps that might not produce much visible vapor, these also arent high enough temps to finish a bowl. I understand that exhaling can be wasteful, which is why I practice rebreathing the vapor. But having no vapor at all is quite wasteful too, which is what was occuring. This is no longer the case. Attaching my ashcatcher for clearance I can connect my solo with the new stem to my bong and get excellent hits at 6 or 7. I actually get decent ones at 5, but it seems to run hotter for me in a bong than it does dry, probably due to the increased pull.
And as for my ABV, while dry and on 7 I can get it to a consistent but medium-light brown. It's not terrible, but sometimes takes a little long to get there. Through my bong I've been able to get it darker, and in fewer hits, starting on 5 for the first hit, then 6 for the next two, then 7 to finish for 2-4 hits, with preheating inbetween each one.