Massive Nautilus X disappointment

Hi guys, I've been an Aspire fan for quite some time, I gave up smoking using the Nautilus Mini kit which was great, I then moved onto the full size nautilus which was just as great. So, it was only logical when the Nautilus X was announced that I should further upgrade, initially I was very impressed with the X, until after 2 days the first coils burnt out, so, thinking it was a bad coil I swapped it for the new one supplied. Another day and a half and that one burnt out too, but I persevered and bought another 1.6 ohm replacement, this one managed to almost a week, then burnt out. I then bought a pack of 1.8 ohm replacements to see if that made any difference, and they did, they gave me another day, which isn't good enough.
Now, before anyone chimes in, I prepped all coils and left them in the tank to absorb juice for at least five minutes before firing, I also have been using 50/50, 60/40 and 70/30 juices, none of which affect how quickly the coil starts tasting burnt. But just for FYI, 80/20 will burn the coil out almost immediately.
I almost can't put into words how woefully disappointed in this nautilus X I am, I just feel let down, the design and look of the tank is brilliant, I have the 4ml extension fitted and it looks and feels great, I just wished it worked as well.
Unless there is a gratis fix for this issue (Vast improvements to coils or the like) then this will be my last aspire product and I will spread the word of how woeful this product is.
As such, can any of you recommend a tank that is as low profile as the natuilus x (with 4ml extension) but that actually works as an MTL?