I've had this happen more than once on the new vertical coils, and one of the SSOCC as well. Despite plucking the cotton a bit, priming, and allowing them to soak for hours...
I've yet to have one of the older horizontal coils give me this problem, however...
First of all, what Wattage are you starting these coils out with? Some juices cannot tolerate high Watts. My all-day-vape likes 12.5-18W, depending on the tank/mod combo, but using the 1.2 Ohm horizontal coils, I can push them to 18W (after the first dozen hits @ 14W). If I'm using the vertical coils, they are toasted if I go above 15W. Your juice has limits, despite what the recommended range of the coil says.
Regardless of anything... start low on Wattage, vape, bump Wattage up... vape, repeat... once you get a slight burnt taste, turn the Wattage down 0.5-1.5 Watts, and that is the sweet-spot for that juice. Once you burn cotton/coil, it is shot, and if you continue vaping with a burnt coil, or burn it badly enough the first time... the burnt flavor is transferred to the juice, and you'll taste burnt flavor even with a perfectly good replacement coil.
BTW, Welcome to Vapor Talk!