It's either the sub0hm coil delivering WAY too much vapor for 50 mg/ml nic salts. A slightly less likely scenario is it's a PG sensitivity. But if you are using the sub0hm coil that came pre installed it's definitely too much nic for ONE. Whether it's both issues remains to be seen.
What sort of "burning" sensation is it, is it a more "I feel scalded" sensation, or more like tingly pins and needles. If it's the latter, well that's what I experienced with a PG sensitivity.
Either way, try using less nic and/or the other coil (and you may still EVEN want a lower nic content, to be brutally honest. I showed up here vaping 12 mg/ml juice on an (admittedly even lower ohm coil) and I was definitely nic overloaded (as a 3 ppd smoker).
Switching to a much weaker delivery system solved my issues, although in all fairness, nic salts are typically less of a throat hit, so you are definitely WAY overloaded, or using more "throat hit" nic salts, but I kind of suspect the former.
Most ULTRA high nic salts are used in pretty weak delivery systems and the Breeze isn't not with the 0.6 coil.
Good luck,
Anna