I've never used a clapton in a tank, but I can tell you that on my drippers, claptons need cleaning more often than standard coils. Those little crevices are gunk magnets.
I don't think I've ever had ANY pre-made coil last me more than a week, though. That sounds pretty typical.
That's what got me building on a kanger t3. I got sick of not being able to fully clean pre-made coils. Even if you can find a way to get the coil itself really clean, the wicking material quickly degrades and needs to be changed. That burnt taste isn't from the gunk on your coil. It's from the wicking material losing absorbency. The juice burns because it can't get to where it needs to go anymore. You could keep the coil as-is and just swap the wicks and it would work more or less like it did when it was new.
You can rinse it out, but the damage is already done to the wicks by then. There's no going back from that.
I will say that thinner juice and lighter flavors help prevent it. If you go up in PG and only use "clear" flavors (as in, the ones that start clear and stay clear when vaped on,) then you should see an improvement in the longevity of your coils.