Well, I think I stay in a state of could be. I could be better, or worse.

Rather think of the better and keep on keeping on.

Kind of pains one thinking of the worse.
Yes, been told that about how I write. Oddly though I've not managed to use it to rub two nickles together. It might happen, might not. At the least it's something I can understand and hope others reading do as well.
We all start out new. I once used to get hoots out of blazing my wick. Oh it was funner than whooping my dog. So I thought until I realized it just might scorch my lips doing that. *chuckles* Besides that I don't whoop my dog anyway, so as fun as it may have seemed, it was soon clear it wasn't.
Your Vg & Pg look good. I use max Vg which is roughly 90% or a little more of Vg. If I don't add any flavorings, I figure it is roughly 95-98%. Mind anyone, I'm not exactly classing myself as a "cloud chaser". I enjoy the mellowness of the Vg but have used a 50/50 mix all the same. I'm a moderate vaper who enjoys modest clouds, modest flavor, finding a happy medium in it all.
Nicotine, ah. That's more than I run but if it's what you feel you need then right on. I run 18 mg per ml and have since using evod style tanks. I now use RDAs and sub-ohm, still using 18mh per ml. This may be something to consider. You might want to drop your nicotine strength. Sometimes nicotine can be an irritant if too strong. Still this is for you to work out for yourself. Not going to tell you you got to drop your strength. This is a special feature vaping has over cigarettes, we got all kinds of choices.
Not too keen on the newer pod style devices myself. Again that's a matter of preference. I read some are good or bad as with everything in life. Like to steer folks to avoiding closed pod systems. If you use those you're locked into whatever the supplier puts in the mix inside. Use something refillable instead. Get to know what you run for your juice so you don't get something nasty slipped in. Even if you only use juice from a trusted vendor, you still keep a level of control using refillable gear.
Stainless is good material. I swap between it and Kanthal. Don't use NiChrome too much. One thing to watch in your pulse heating of steel don't get a sustained temperature over 19,000 F, try staying lower than that or 25,000 F for Kanthal. More often than not though our "pulsing" heat through our coils
doesn't get, or stay hot enough to release toxins with our vapor.
It's still one of those odd facts to bear in mind, contrary to the new PSA adverts running on the Tell Lie Vision. "Oh the horrors! You're vaping all kinds of heavy metals! Think of the damage to your lungs!" D'oh on you Tell Lie Vision ads, I already did and went and looked stuff up to see for myself. *grin* One day I might get a mind, or maybe not. It could be dangerous.
I'm running about a 0.6 ohm coil presently. It's reading 0.63 but I'll round it to 0.60. Sometimes I drop to 0.30 but try not going much lower than that. A good range I find is between 0.30 to roughly 0.50. This works for me well on mechanical devices and regulated ones. It doesn't get too hot for me to vape and gives me enough flavor. I like running single coil setups too. Don't see any difference using a dual coil setup, only more to contend with to get a vape right for myself.
Well about all I see might be your nicotine strength. You can try lowering it and see if that takes away some throat irritation. If it does that might be what was a cause. Sorry if I appear to use words which leave some ambiguity, like seems, might. We kind of have need to do that though as vaping is rather subjective. What works for me may, or may not work for you. If you find what suits you, don't let anyone tell you your way is wrong. Now listen if they're informing you of battery safety, or safety issues sure. There may be something to what they're saying. You can usually tell in how they convey it.
Yes, nicotine is addictive. Coffee / caffeine is as well. As long as you don't over do either one though you're reasonably safe. That's about where nicotine stands too, like coffee. At least if you vape you reduce the risks that come from using cigarettes. We're told vaping is about 95% less harmful by National Institute of Health from the U.K., not that such a prestigious source be trusted here in the U.S. of course. Nicotine on its own does not cause cancer in case you wonder. It's all the added *cough*shit*cough* they put with commercially processed tobacco what does that.
They clean out factory farm chicken houses with formaldehyde and industrial bleach for example, and it's used in your cigarettes too to amp up the nicotine charge. And yes formaldehyde is naturally released into the air anyway, but not in the concentrates found in cigarettes. --- Here let me tack this on. I'm not a doctor or scientest nor pretending to be. I'm just a dumb Hillbilly what likes reading Bazooka Joe cartoons on gum wrappers.

As Joe says, "the more ya know!"