I Find a 306 atty is preferable. Both the 510 and 306 atties I use are low resistance. So far the 306 atties I've used have come with no primer liquid in them making them quicker to break in. I use a Reo Grand and I've found that a freshly charged battery can be on the hot side resulting in a burnt taste. Trying to combat the "hot" toke I find myself pumping more
juice but this can result in splashing, I hate that. Using the plastic tip that came with the atty or a carto will greatly reduce any splash. After running the Battery down a bit then a regular drip tip and conservative squonks and I'm in Bliss. I'm starting to think I should use a standard resistance atty with a fresh charge battery and then swap in the LR after an hour or so. I think I'm starting to see what the benefits of a VV, Darwin, or kick would be

. I'm hoping they come out with a Kick that will work in my Grand soon.