I just started DIY juice mixing, and i've been running into a couple problems. Before DIY, i was vaping premium juice at 6mg. When i bought my first batch of 12mg nicotine 100% vg, i shook the nicotine, i diluted to 6mg, and it seemed really peppery at times. I tested both my vg and pg separately. And it ruled those out. I ruled out flavoring by trying unflavored 6mg. I am able to vape 6mg if i keep it under 40 watts, but then i experience leaking. So i know now that i must do max vg and high watts(40-60 as my aspire cleito suggests)So i bought some new nicotine thinking i didnt shake well enough, i made sure to shake the new bottle like crazy, but still found it peppery. My question is, do most premium juices use sweeteners to mask the nicotine? Does steeping remove the harshness of nicotine? Thank you!