Your blog post was informative and helpful, thanks for pointing me there.
Fwiw, I use the term "chain vape" though in fact, I wasn't really sure what it meant exactly i.e.; how many vapes a minute constitutes "chaining". I knew I must be vaping with more frequency than the heads were meant to run at though because I 1) the top coils were not my friends at all and 2) the BCC were also starting to give me some back-talk, though this may be related to wattage after reading your post.
I also wondered if I was drawing too hard. I still wonder that actually.
Finally... popping. From what I can observe, the popping is caused by some juice slipping its way onto the contact. (?) How is that occurring?
No, the juice popping is happening on the coil. It occurs because the juice inside the wick heats up and blows some of the juice off the wick with a 'pop'. An occasional pop actually gives you a good idea that you are in the optimal zone for a factory wick. Excessive popping would indicate the voltage is too high and this may indeed contribute to juice dropping down and getting on the contact. Usually I don't see anything much except for a bit of condensation on the contacts at the end of the day. A wick that is quiet and never pops means it's a little on the cool side for maximum vapour production. Nothing wrong with this if you are happy with the way it is running though - It won't burn and the coil head will last longer. I will run it this way if I'm out and don't want to be making huge clouds - it makes stealth vaping a little easier without sacrificing much of anything else.
Recently at work I only had a twist with a Protank on it. Instead of setting by ohms/voltage I just started at minimum volts and kept turning it up a little and vaping. As soon as I heard the wick start to give a little pop I left it there. Later when I had time to look at it I found it was indeed right in the Goldilocks zone - between 6 and 6.5 watts effectively for that resistance so you *can* set these by ear if you have to.
Chain vaping is not a set term so it will really depend on who you talk to. I define it as constantly taking a long puff with hardly a breath in between. Since the nicotine absorption from vaping is much slower than smoking it's possible and very easy to get too much nicotine if you do this for an extended period.
If the Protank is cold I will usually chain vape about four or five times to get it working like steam turbine (can no longer see the monitor in front of me for a moment), and then slow down to 2, 3, or 4 puffs a minute. Once I don't feel like I need nicotine any more I'll put it down. This is well within what the Protank is capable of.
If I'm chain vaping to fog up the room for the amusement value it is possible to go harder than what a factory head is capable of. I find a thick vapour almost as satisfying as throat hit, even though it's mostly psychological (but a thick vapour does deliver more nicotine and faster). If the base is quite hot to the touch I know I'm probably going a bit too hard.
As for sucking too hard: The original Protanks had an airy draw which was tightened up on the second generation devices (T3S, Protank 2 etc) and I believe that this is to their detriment. More airflow equates to more vapour and flavour
in my opinion. For this reason I drill out the air holes on the newer devices to make it an easy draw and don't feel like I have to suck very hard at all. I prefer to regulate the airflow myself, same as I used to do on a rollie.
Sucking too hard on a bottom coil device creates more negative pressure at the coil, and can draw more liquid through the wick. If someone constantly has flooding problems on a tight draw, then this is something that might need to be looked at.