The reality is that if your tank is going through the juice, and it tastes good, that this is really the performance that's considered the best. It means your device is wicking beyond optimally and it's probably why so many people report a clean, moist vape from the iClears. I didn't have this experience with them (it wouldn't wick properly), and so my tank barely ate up any juice.
The Protanks and things eat up much less juice, but to me, the flavor is non-existent, often burned, and the vapor is very poor. If you have a device that tastes great to you, my advice is to really tough it out and stick with it - a great tasting devices is pretty rare imo. If it eats up the juice, it really is doing it's job perfectly.