I wouldn't expect much change other than a much smoother hit, and maybe less of the nicotine "taste". I use 18 mg/ml nic salts in all my DIY mixes, and really only noticed that coil life etc. improved, however, I think that is more an artifact of starting DIY than anything to do with nic salts themselves.
Plenty of folks are using them, and coil life just doesn't seem to come up as an issue. I find my nic salts almost flavorless when I taste them, but what I really like about them is the lack of throat hit. I think your plan will decrease harshness, and not do much else besides that.
Best of luck,
Anna