I spent about 2 hours with my local vape seller yesterday because she had never heard of nicotine being a problem with anyone, but suspected the PG/VG ratio. We went from 24mg to 0% nicotine & 100% to 70% VG, back and forth until we found out it is the nicotine that irritates my throat. I am/was a 1-2 PAD menthol smoker, but I smoked lights because of the throat irritation. There is not enough research done yet, but I do not think I have a PG problem, I have a nicotine irritation problem. Because my primary goal with vaping is to cut out the analogs, I have bought everything from 24mg nicotine to 0 nicotine, flavored and unflavored so I can mix a bit to get the nicotine I need to kick the analog habit BUT not hack up a lung in the process. I am not sure if this is your issue as well, but as with all of us here, it's a process we have to perfect on our own to find what we need & like.
BTW I have heard very good things about Alice in Vaperland's products and have an order coming. I'll let you know what I experience since we seem to have the same problem... If I can find this post again >.< Good luck BTW! This is my 1st 48 hours without analogs and I am feeling no need for the analogs except reaching for them and looking around out of habit... then I realize I am vaping for my nicotine instead

And this is simply maaaaaaaaaaaaaarvelous because of the magnificent juices available far outweigh the basic menthol I was stuck with before!