I didn't care for that recycled
juice taste from bottom feeders.
All in the technique.
There is a way to do squonking sort-of wrong. It's pretty fool proof, but there are some things people unwittingly do that will affect the juice taste slightly. It requires some simple techniques to follow.
If your constantly squonking while the coil is still relatively hot, your going to cook some juice that will go back down into the bottle. People ask this all the time: "Why does the color of my juice get darker in my bottle?" Answer: "Wait like 3-4 more seconds before you squonk so your coil cools down."
Also, if you let your coils get too gunked up, there's a chance that fresh
e-liquid will mix with that carbon build up and get sucked back down into the bottle. I change out my wick every morning. I do a quick dry burn and run the coil under water every time I change the wick. 2 minutes tops. I've got a twisted 28g coil that's over 4 months old now that's still lookin' and performing shiny and new.
One last thing that will infect the flavor of fresh juice in the bottle on it's journey up and down from the RDA deck is using too much wick. You don't need to store/hold mass amounts of juice in wick to be heat drawn to the coil with a bottom feeder. The juice stored in all that cotton will get to be a bit "cooked" as well, and when you squonk fresh juice from the bottle it's going to mix with that old juice a bit and then flow back down. With bottom feeders, you use only enough cotton/wick to fill in the inside of the coil and barely touch the deck in order to absorb fresh squonked juice. Good enough for 3-5 hits max. Basically, don't be a lazy squonker trying to get 15 hits between squonks! Your going to squonk more than you would have dripped, it's a trade off. Dripping involves so many steps, you naturally want to get more than a few hits out of the effort. Is squeezing a bottle really so hard that you don't want to do it other than after at least 10 hits? Keep the deck free and clear, and squonk more often getting less hits between squonks.
Clean coil + Minimal wick + Clear and efficiently flowing/draining juice hole = Fresh clean on-demand juice all the way through a bottle. No recycled taste or darkening of
e-liquid. And yes; the solution to dripping behind the wheel. (hell
dripping anywhere)
I do drip & drive! Tho my other half does the drippin & I do the vapin 
