Uwell Crown - Coilhead life, question

Sup, I recently got my Crown tank.
We're trying to build a nice relationship but it is behaving badly in terms of the coil life and leakage. I've checked simillar posts - there's quite a lot of users having same issues. The leaking seems to be fixed thanks to a guy who suggested installing the coil when the tank is screwed off the mod, but the coils worry me quite a bit.

Anyway, here's the album: https://imgur.com/a/qwySG First two (1 came with the tank, the other one purchased) are the coils that I used for 3-5 days max. They look quite bad imo. Please carefully inspect the third photo - this is a new coil I've installed, let it sit for 4-5 hours and then started slowly on wattage (0.25 ohms, went from 30w to 60w) Should it have that yellow/brown cotton? Is it normal?

UPD: Juice I'm using - Sweet Lovin' by Mr. Good Vape. It is really sweet one, assume this might contribute to the cotton color.