I'm a little perplexed here. I haven't tried any of the juices you bought, but the ones I have tried, not one has come up with a chemical smell. The "pepperiness" could be attributed to nicotine. Ahlusion doesn't play or water down their nicotine. If they say you are getting 18mg of nicotine..you are getting all 18mg..no substitutes. When I did my traditional 24mg with Ahlusion, it took some getting used to. I realized what I was missing with other vendors. Possibly crank up your pg/vg ratio a bit to 50/50..that might smooth it out a bit.
Test your juices out every couple of days or so. Vapes I enjoy right out of the package seem to really get even better as time goes on. Smoother..blendier...and worth a steep if I could just be a little patient...but I'm not..so I get that smoother tip on my Ahlusion juices around the middle of a 30ml bottle. Also, for the record, Ahlusion uses natural extracts and flavor blends, which might be a bit strange if you aren't used to it. I was so used to fake tasting flavors and actual chemical flavors, that while Ahlusion was great..it was also something to get used to. Who knew a Strawberry could be so fresh or a blueberry could be so tart. The cake is beautifully done. The mint is wild and breezy and chilling. Combat that with my nic buzz and I was all over the place trying to figure it all out.
Also take a good look at your equipment. I have tried Ahlusion in cartos and tanks..but they aren't half as good to me as they are on my atty of choice and my squeezy box (vmod xl). Still a nice vape..but so much more flavorful and complex with my favorite set up.
In closing..some juices you just have to set aside and forget about them for a little while. Come back in a few weeks and they are finally where you want them to be, tastewise and sometimes you just have to wait and see..maybe they are the juices for you..maybe not so much. Take it one day at a time and just see what happens.
Wishing you all the best. Hope it gets better for you.