I should think that the control valves would help quite a bit. Protanks V1 were too airy, the V2 seems OK airflow wise, and I've found the perfect way to have coils that work - I rewick and recoil them myself. It takes 5 minutes, and saves around 1.5. And you know if it's well made ... or not 
Take a tour on Youtube, as there must be HUNDREDS of videos on wick and coil making in many languages.
Once you get the hang of it, it's not hard, just a bit fiddly. But worth it, IMHO
As for half empty gurgling, or other problems, I've found nearly all the bottom coil devices have this hassle for some reason, so I fill them when they get to the gurgle mark.
But why did this never happen when they brought out the cartos with a bottom coil ? Maybe it is the larger diameter of PT's etc, just up to the 6ml Hypertanks. I have found that Aro 3.5ml Glassomizers don't have this problem so often as Protanks but I don't know why.
There again, life would be very boring without mysteries in it, so I guess I can live with PT's that gurgle
Take a tour on Youtube, as there must be HUNDREDS of videos on wick and coil making in many languages.
Once you get the hang of it, it's not hard, just a bit fiddly. But worth it, IMHO
As for half empty gurgling, or other problems, I've found nearly all the bottom coil devices have this hassle for some reason, so I fill them when they get to the gurgle mark.
But why did this never happen when they brought out the cartos with a bottom coil ? Maybe it is the larger diameter of PT's etc, just up to the 6ml Hypertanks. I have found that Aro 3.5ml Glassomizers don't have this problem so often as Protanks but I don't know why.
There again, life would be very boring without mysteries in it, so I guess I can live with PT's that gurgle
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