Burnt taste in any liquid usually comes from running at a higher voltage than the combo of device and liquid can tolerate. I know you said you shoot for the highest resistance coils you can find for those devices - which is good. But you can still be running it too hot and crashing right into burning crud onto the coil within a few hits. Once that happens the damage has been done and you can't reverse it unless you clean the coil.
I've said it a million times already - Kanger BCC stuff doesn't like or need high voltage. I put what is supposed to be a 2.2 ohm coil in a ProTank today - it's actually metering 2.6 ohms. (A Tesla and a Vamo 2 both read it as 2.6 ohms.) Even then, I'm running that thing at a humongous 3.1 volts as a new coil. If I dared run the voltage up any higher it would ruin the experience. Not kidding. I'm getting so much vapor off that thing at 3.1 volts I could vape myself sick if I chose to.
Try a clean coil and dial your Twist all the way down before trying again.
I've said it a million times already - Kanger BCC stuff doesn't like or need high voltage. I put what is supposed to be a 2.2 ohm coil in a ProTank today - it's actually metering 2.6 ohms. (A Tesla and a Vamo 2 both read it as 2.6 ohms.) Even then, I'm running that thing at a humongous 3.1 volts as a new coil. If I dared run the voltage up any higher it would ruin the experience. Not kidding. I'm getting so much vapor off that thing at 3.1 volts I could vape myself sick if I chose to.
Try a clean coil and dial your Twist all the way down before trying again.
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