Hmm...yea I think a general consensus is to vape less.
Currently I am using MFS nicotine, originally mixed at 6-7mg. The problem with it was that I was getting a lot of throat irritation, throat hit, and "pepper". I thought it was the PG and went for high VG mixes. The irritation was completely due to the nicotine, reducing it to 3mg solved all irritation, even with a high PG mix.
I have some nude nicotine that I've started using, and mixed a 4mg batch with no problem so far. Will bump it up in .5mg increments. I will see how far I can take the NN, and try ordering samples from VaporTek and Chemnovatic. I've heard good things about both of them, maybe I can get some smooth mixes at higher nicotine and vape less as a result. Thus resolving some of these issues.
I did buy Biotene based on recommendations, but the new one with added mint seems to do more drying than moisturizing.