Well I bought some menthol juice today 11mg nic at a e-cig store I found by accident in Gumi City, Korea.
Blew out the Janty Orialntal 16mg I was using and filled a brand new tank cart with the menthol and well all I can say is the burned taste has gone away and the mentol is v nice. Plenty of vape, not hot, no nasty smell or taste so far.
I didn't think I had burned out two brand new attys as the tank carts literally flood the hell out of the atty and even after a few puffs without the tank, when you do a blow thru to clear out the atty with air after that, a good 2 - 4 massive drops still were coming out, so it definitely wasn't dry burning out...
Also when I was in the store today sampling juices, I found their (brand was lily) e-cigs tasted like burned, gacky cr@p when they gave me a high nic strength 'tobacco / trad cigarette' flavour... Now their units could be burned out due to lots of inexperienced customers sampling, but I doubt it coz they would want to use good units so the customer got the most pleasent taste.
so it looks so far - and fingers tightly crossed - that it was just the Juice I was using (JantyKorea Oriental 16mg...)
Will report back after tonight as I plan a whole cart huge vape sesh just to make sure the burned taste and gagging sesnation doesn't return.