I have yet to have the problems you are with these coils.....specially in the heat department.
It's interesting...the heat was only after the initial charge it appears. It was super hot for the first tank, but it seems fine now. I'll circle back if it does it again. Pretty strange.
And I tried 2 different 50/50 fruit juices, and both of them had the burning flavor I described. But I just put in a 60VG fruit juice and it's far better, and less burnt tasting. So strange, since I would think a thinner juice would help with those small holes. So, it's better now. Still not great, but much closer to the "eh, okay" department on flavor.
So drysprocket, can you touch on the pros and cons of the AIO versus the Endura T18?
It's tough, since my Endura was from their first batch of stuck firing buttons. They fixed it, and I should have sent it back to the vendor, but I was lazy. So I'm not sure if this is just me, since no one else seems to mention it- I get major flooding all the time. Juice eventually creeps up into my mouth with the standard drip tip, even if I draw really lightly. Changing to a wider bore tip fixes it, but sort of takes away from the best part- that nice draw.
So I'm not sure if I'm alone, but aside from that I think it's an overall better device because of the actual vaping experience and flavor. But form factor, I think the AIO has the edge. It's just so small and nice, but flavor isn't really comparable.