Cigatron how big of a piece of cotton do you use to get that tight on the pre built coils?
I no longer use cotton. When I did I used Ko Gen Do. I'm strictly I rayon man these days.
A couple of ways to check for heavy wicking density:
1. Wicking drags hard when pulled through the coil.
2. The wraps of the coil move slightly while pulling the wick through (24g and smaller wire). You may not see the wraps move with 22g or larger wire, large gauge twisted or large gauge claptons.
3. Wick does not slide back and forth in the coil easily once pulled through.
4. While wiggling the wick on one side of the coil you should not see the wick move on the other side of the coil.
In my experience all 4 of these wicking density checks help to ensure that I'm going to get a dense flavorful vape.
That said, there are other factors that contribute as well, eg wick tail management. A good example would be the question, "How tight are the wick tails pressed against the juice holes?" Too tight and you're going to restrict air movement into the tank which restricts juice flow; too loose and you're going to flood the coil resulting in a spitty, hot, harsh vape. Too loose will also cause leaking while filling the tank. Same with the rba.
As you know though, words like heavy, tight, light, big, small etc are totally subjective so it becomes near impossible to convey effectively one's experience with "how much" wick to use. Oh, I'll ramble on for hours about it, but the best way to discover the optimal wicking density for a particular wicking medium is good ol' trial and error. Sounds like you're on the right track though.