Hi, Samsmom. I'm glad you like the flavorless. I do the same thing.
I just vape an occasional tank of flavorless (100% PG or 80/20 PG/VG mix with just a little nicotine added) eliquid until the juice in the tank runs clear. That's my maintenance. I got that idea from LGD and it seems to work just fine (PG is a decent solvent). I've been using the same two atties for almost two months and only cleaned them three times. First I boil them for 20 min in distilled water--just pop them, fully submerged, into my microwave. Then I flush them several times with the boiling water, soak them for 15 min in vodka, blow the excess out, let them dry a few hours, and then do several short (4-5 sec) dry burns until the entire coil glows orange. Then another quick rinse with vodka, to get the ashes out, blow out the excess through the battery end, let them dry a bit, and they are ready to go.
I do clean my tanks regularly, of course. I know that luck has a lot to do with it. I got four atties altogether and all four are fine. I know that alot of people have problems or got duds. But if you buy from a reputable vendor, they will replace the defective atties, so my risk is zero, really. The tank cartridges last forever.
I agree that the flavors might seem muted sometimes, but I happen to like subtle flavors, so that doesn't bother me. The juices I use are light-colored, transluscent, barely flavored, usually 80/20 or 70/30 mixtures. I use my tanks on 3.2 as well as on 3.7v. I think I prefer the 3.7, but the LR atties are very nice on 3.2v.