Good post Anna. I usually have three set-ups going per day. Rotating them helps them rewick and perform better. You dont get played out on one flavor that way either.I think the Crown Uwell tank might suit you. I've heard decent things about the fireluke as well.
However, since you seem to be reporting shortened coil use in ANY tank you've used, I also might suggest looking at your eliquid (sweet, dark high VG juices or NETs and WTA are all gunking factors). You may want to look into different flavors, different wattage ranges and maybe have more than one setup running at once, so if you chainvape, you can spread it over more mods, resulting in less heat in the tank, which is also definitely a coil killer. I was surprised at how much longer my coils lasted, simply taking the latter step and rotating setups so none of them overheat. Temperature control mode might also help with that, although you have to have the correct coil wire to make it work and it may not be possible in your current setups.
I can and will say that the Zenth tank does also have coils with pretty amazing longevity.
Anna
I vape DIY juice. The commercial stuff usually is way too sweet for me. That stuff really does cake on coils and ruin them.
Another tip I NEVER read about is, don't take long drags at higher wattages. The longer drag you take, the more juice is vaporized. The wicking material needs time to re-soak. Alot of coils on the market just can't take it. The printed on "best used" numbers are usually overrated. Sometimes I think these companies want us to fry our coils faster, so we will buy more faster.