as you increase wicking material you increase lost efficiency. If you've got a foot of silica in there, just because you vaped what's in the coil doesn't mean every last drop is gonna make it to the coil, it doesn't know to 'go' thereit just sorta spreads out. Theres a fair amount of diminishing returns after you get more than can easily be stuffed into an Igo-L.
I do have 1 design I'm working on that will be a complete departure from current rba designs but I don't have the time to prototype it right now with all the other projects i've got going, maybe in late feb/early march.
Thanks Lance, I guess you really do learn something new every day!