I prefer smooth juices myself, which is why I bought nic salts... They're reputedly smooth-hitting and my throat was in such horrible shape, the LAST thing I wanted was a harsh throat hit (though I understand why it can be satisfying...) Nic salts are reportedly (by some makers, like the Juul) also more quickly bioavailable and more closely mimic how nic hits you like "real" tobacco. I'm not so sure about those claims, as there are different ways of precipitating or however you do it chemically, nicotine into nic salts, but I ordered some from Nicotine River and I very much liked them, and found I wasn't using any MORE juice than regular nicotine.
Do know that Nicsalts haven't been studied much side-by-side to regular nicotine that's usually vaped.... Though as far as I can tell if I'm not combusting them and not using any more nic than I would ordinarily, I don't see a huge problem, but I am not omniscient or anything, so the fact remains: they haven't been much studied. Though Juul users are wandering around at a 50mg/ml level of nic salts (to be fair, the power in the device is low, you aren't getting a lot of vapor off one pull, but that lack of harshness is one way the Juul seems to be able to go that high in their cartos without people dying from 50/mg/ml throat hits....) and not dying off suddenly or anything.
So, they may or may not be useful to you. Some venders offer different levels in their nic "harsh, smooth, regular" but I have no idea what that actually means as far as the nicotine itself?
In any case, with 70-80% PG, you likely won't have a huge throat hit unless you do something like flavor very heavily with menthol or something like that, I'd think. In your situation I'd probably try some different nic from different vendors to see what you prefer....
Good luck,
Anna