That's unfortunate that you are having issues
My second crown showed up yesterday and I primed the coil, cleaned the tank with dish soap, threw the mod in SS temp control at 400℉ for break in and went on my way and put 5 tanks of juice through it alone yesterday with no issues. There was about a 1ml break in and it was good.
Between my buddies they own a total of about 6 crowns and none have had issues and my two crowns also with no issues
Google Uwell Crown tastes like crap. I am far from the only one having this issue. Guys at the vape shop thought I was more sensitive to nickle and SS and that is why it tastes like crap to me but I have used both in my own builds and it never tasted like this. Maybe it is the specific wire they use. Now that I have 2 full tanks through a single coil the terrible flavor is gone but that is entirely too long to "break in" a coil and vaping through it is painful. I will keep the tank just use the rba.