I'm not sure what you're story is (specifically, how long ago you had ETS), but I didn't sweat from under my arms for the first year or so. After that, the sweating gradually returned, and now I can get massive pits stains just like the best of them.

Regeneration, my friend, is the only way to explain it.

I'd also like to note that I have seen a reduction of CS over the years, but I'm not sure if I have just grown accustomed to it.