Update-
I cleaned out the clearomizers, tried a fruity flavor in one and clove in the other. Both were still harsh, but much less so. This morning I went back to both and they are fantastic! I didn't think to mention that I've been coming off a chest cold the last few days and the congestion was just not working well with the vape... apparently this morning a lot of the congestion had cleared up and the chest hit is much less harsh!
I didn't think it was an issue simply because analogs didn't hit me in the chest the same way with the cold, so I just didn't think of it as a linked issue. I will still probably switch to 12mg nic in the future, but this 18mg juice isn't a show stopper at all! And for what it's worth, the analogs are less desirable already! I've had two since yesterday, and put both out at halfway, thinking the same thing both times- "I'd rather be vaping, it tastes better!"
Win!
There ya go!
Relax and let yourself enjoy the tastes and all. That actually seems, to me, to be the best "technique". The nicotine absorption is slower so you don't want to rush and it's through the membranes of the mouth and nose both of which are involved in the sense of taste. Smoking delivers the nicotine much, much faster (as little as 7 seconds I've read) but that's from drawing the smoke into the lungs. Gets the nicotine into the blood stream fast.
I got into the habit of slowing it all down. Holding a bit in the mouth, tasting the flavor, exhaling through the nose and not in a rush. That seems to deliver the nicotine I'm so (unfortunately) hooked on and is a pleasurable experience. Much more so than cigs.
I don't get a "chest hit" at all. My lungs aren't involved much at all except to, well, power the inhale and exhale (obviously). No taste buds down there.

And I can't inhale the vapor like that anyway, I cough myself silly. Water and lungs, not a happy combination?
I've actually cut the nicotine content in the liquids I ordered (and arrived today). They're 1.2% (12mg). I found that the 2.4% seemed to kind of "burn" my tongue? Knock my taste buds for a loop for a while. Also noticed that I was having trouble falling asleep. I think I vape too frequently for higher nic levels? So I'm going to try a lower level, see how that works.
I do vape fairly frequently. But it just tastes
so good.
My experience is that the more you learn how to do this vaping thing so you get to enjoy the flavors and, call it, "experience", the more you get that, "I'd rather be vaping" going. And the more you start to get a, "What did I ever see in these things?" when you do give in to smoking.
(Which I still sometimes do but the time between grows longer all the time. Eventually, I hope it'll hit "infinite".)