If you're atty was improperly prepped for use or had a defective wick, the burnt taste will be hard to get rid of. I've had this happen and the only solution I'm aware of is to dewick. Advice from Cisco himself.
I believe the Joye 306 ships with primer, so I don't think you vaped it dry, must be a crappy wick that will need to be removed. Use tweezers and pull it out.
For dry shipped atties like Cisco/IKV, put in about 8-9 drops and WAIT - I like at least 30 min. Then 3 more drops activate once or twice, short bursts without inhaling. If all seems well you're good to go. If it's funky add a couple more drops.
For Joye atties, blow out the primer as much as possible, then do the steps above.
Hope that helps!