Exactly my thought. I find the flavors stand out better if I don't smoke the same one all day. I have been fueling up three 901s each with a different juice plus a bling & rotate them throughout the day. The next day I will switch flavors in the 901s. Using different atomizers keeps the flavors 'cleaner' but I may be missing out on some good combinations.
At first, I just topped off the carts with whatever flavor I felt like. For me, the combination wasn't better than the individual flavors. So I first tried keeping the carts separate with separate flavors while using the same atomizer but something still was not right. Fairly soon, they all just started tasting the same (actually, almost like a burnt taste).
I ended up blaming that on the accumulation in the atomizer and since I'm not the type to wash or drain them every night, I figure it was just easier to keep them separate too. When one goes, I rinse it, let it dry and attach it to the corresponding cart; if it dies, I just get out a new one. It's not a lot of work; it's actually pretty easy once you get it going. And i never worry about being without a working atomizer
I do want to experiment with some combos, particularly with my coffee flavor. I'll give it a shot. If I don't like it, I can always clean the atomizer and start over with a fresh cart. It kind of becomes "a science"....lol
Lu