Now that you mention it, I've thought about trying out the Aerotank or Genitank (sounds like they are similar) for quite awhile now, but with all the hype lately, I thought it might be better to go with something newer, which is why I tried the subtank. Now I'm looking at Aerotank reviews and they sound a lot closer to the way I vape and with their 1.5 and 1.8 coils, they should work fine on my iStick. Thanks for the reminder. A larger Aerotank could make a good companion to my GS Air for those times when I'm out and want more juice capacity.
I'm going to definitely investigate that. In the meantime, my first GS Air coil is now on Day 6 and is vaping as well as it did on Day 1! I have yet to rinse it, dry burn it, or anything else. If these coils are longer lasting, I may not even hassle with rebuilding.