As you add more you go from bland crispy harsh sensations in the mouth, to knowing it's not the same any more, then to actually tasting something ... but it's hard to put a name to it, then to yeah, I think it's salt.

I miscalucated my first dump and got to the "yup it's salt" in one shot and that was pretty obvious last September. I should have done what you can do now.
Dump, swim. Should I add a bit more? etc.

It sounds to me like you've made the biggest improvement already.

One other point. If you keep adding it you will eventually get to the point that evaporation of the top of the pool cover, if you use one, will start to leave a definite white residue.

Good luck