Corrected

Water A+
The manual regenerations and media fills seemed to have corrected the problem.
Calcite needs filling.
Also, I'd still like to replace one check valve and I think I need a new bladder on my well pressure tank.
If a problem resurfaces I'll need to check for backwash leaks, as always, and inspect the first PVC check valve. Otherwise, confirm all media is topped off and manually regen as necessary.