I DIY with nic salts but you can also purchase nic salt juices. I am at 18 mg/ml with really no throat hit at all. You could probably go higher if it's needed.
Really, only two differences (slightly more absorbable faster, although some folks don't notice that. I suspect really high concentrations might be needed to "feel" the effect, although if regular nicotine is harsh it certainly might benefit you (I would probably sub out 1:1 your current liquid, if it's satisfying you other than being unvapable. If you even want to go a little higher, you probably could, although I'd be on the lookout for nicotine overload sx if you do go higher, ,just in case (yawning, headaches, dizziness, nausea, hiccups, etc.). Just to be on the safe side.
It's a good option if you are having trouble maintaining your "optimum" nicotine strength though.
Good luck,
Anna