No, I haven't changed any pins, and don't really plan to. That parts been working for years as you said, so I see no reason to change it. I haven't cleaned the injector yet, as I wanted to make sure the brine tank overflow issue was fixed first (it is, at least the safety valve part of it). Plus, this thing is shoved TIGHT into a little wedge-shaped closet in a modular home, and a tear down isn't going to be easy. It hasn't regenerated on it's own since I ran the 2 manual regens back to back. I'm sure we haven't used enough water since then to make a regen happen, unless one kicks off tonight.
I'm going to get the water tested, and just see how it works as it is now, with what I've already done.
Thanks for your help so far!