I am usually running 2-3 tanks at a time with ko gen do,and yes, I still use kanthal. When I replace wick I break the tank down and give an ultrasonic bath after dry burning coil and checking integrity of coil. After ultrasonic cleaning for 15-20 minutes I blow with air compressor and coil is like new and shiny.Rewick and ready to go, I also DIY my liquid. Amazing how much less gunked up my coils are versus when I used to buy premade juice. Back then I was cleaning and rewickicking every few days, maybe a week if I pushed it.
You know now that I think about it I rewick after about 6 tankfulls, I just fill the tank less often than you because I am runing 2-3 tanks all day. I only vape about 4 ml a day roughly.
I clean my tanks regularly too. And tho I have many tanks, I usually favor 1 or 2 at a time. I haven't touched my k4, SqR, erlkonigin, etc in months and months. Right now in bouncing between my GSL and aromamizer mainly with the gt2 once in a while. (and I really want to love the gem, but I just don't)
most of the juice I use is DIY, I go between KGD, muji/puff, and rayon. 99.9% of my build are TC, either ni200 or Ti grade 1. And after 3+ tanks I can usually taste the coil gunking up. But TC Coils can't be dry burned, so instead of trying to clean like some do, I just rewrapped a new coil and rewick. Just me... Ymmv