In my experience, the wicking threads are optional, and don't really effect the performance of the atty...and will even enhance the performance of a bad tasting/poor performing atty.
When I get a new atty I blow out the primer, drop 4 drops of juice on the bridge (about twice what you would normally if you're a dripper), then put on an empty cart and vape 'til I get a good drag (usually around 3-4 drags when the good tasting one comes). Then I drip another two drops and put on a full cart. I've noticed that this initial full cart will drain really fast, I'm guessing because the atty is free of primer and relatively dry. After about 7-8 drags, I'll have to refill the cart. From then on, it's business as usual...well, until the atty's vapor production starts to drop off (anywhere from a few days to a few weeks, depending on atty), then I'll pull the threads, and BAM, back to copious vapor production, for awhile at least.
Above all, keep your atty wet, if you run your atty dry to often, you run the risk of scorching the wicking threads. You can tell by looking at them, if they look brown or black, they're burnt. However, if you use darker colored juice, it's hard to tell....if it tastes consistently burnt, it's probably the threads. At this point, you should pull 'em out, you got nothing to lose!
When I get a new atty I blow out the primer, drop 4 drops of juice on the bridge (about twice what you would normally if you're a dripper), then put on an empty cart and vape 'til I get a good drag (usually around 3-4 drags when the good tasting one comes). Then I drip another two drops and put on a full cart. I've noticed that this initial full cart will drain really fast, I'm guessing because the atty is free of primer and relatively dry. After about 7-8 drags, I'll have to refill the cart. From then on, it's business as usual...well, until the atty's vapor production starts to drop off (anywhere from a few days to a few weeks, depending on atty), then I'll pull the threads, and BAM, back to copious vapor production, for awhile at least.

Above all, keep your atty wet, if you run your atty dry to often, you run the risk of scorching the wicking threads. You can tell by looking at them, if they look brown or black, they're burnt. However, if you use darker colored juice, it's hard to tell....if it tastes consistently burnt, it's probably the threads. At this point, you should pull 'em out, you got nothing to lose!