Yeah, switching up is definitely key. I think this is one of the several reasons why I pretty much just direct drip. I usually switch flavors at least twice a day. Another reason goes along with what Sooner said: other methods including cartos just seem to mute and reduce flavor on their own compared to dripping into a regular old 510. My atomizers usually last me a pretty long time. Sometimes a few months! Here is one thing I noticed just yesterday though. I had an atty I have been using for about a month and everything seemed fine. I felt like my Ms T's Pineapple e-juice was losing a little flavor though. Well that atty abruptly died for no apparent reason and forced me to grab a brand new one out of my stash. Whoa! It was like someone turned the flavor faucet back on! Apparently even though our hardware may appear to be working properly, as it gets older it's quality is reduced. Since the performance drops off slowly, we may not recognize it as it happens, but after awhile flavor and vapor reduction do drop off.
I guess the point is that it really doesn't seem like the juice is changing for the worse over time, but the hardware does. Kinda like how as the spark plugs age in your car, you tend to lose a little power even though the gas you are using is still the very same.
Brandon
Ms T's Bakery