You guys need to upgrade your gear, so im finishing up some experiments right now but so far using the
smok tfv4
coils (this is tanking the NET not using a dripper) I'm getting above 50 ml per coil , that is still 2 coils a week for a heavy vaper but MILES ahead of my old experiemtns (kanger protank I believe where I too would only get 15-20 ml)
I think its just the surface area difference, I'm comparing homemade diy filterd to 2 micron vs black notes stuff right now and so far about equal (but like I said im still finishing some runs)
I think the sugar theory is wrong too , otherwise we would see a huge gunking difference between different tobacco varieties (so burley and kentucky would be way less gunky than say virginia / maryland) - and we don't see that, I also don't think its the waxes (diterpenoids) simply because of how much of the volume they make up (also they hold lots of our flavor molecules)
hypothesis right now is that its polysacharides (amylose and amylopectin) , i'm going to do a sub micron filter batch with nuclepore membrane paper and see whats what, from talking to others you apparently lose some flavor at or below 0.5 microns but we will see.