I had poor cold water pressure in the shower. Full pressure everywhere else. Removed valve bodies, saw broken and dried rubber gaskets.
So, I replaced both hot & cold American Standard 2 handle valve bodies. New valve seats.
I proved water pressure OK, I think, by means of water squirting out without any valve body.
Now, the cold pressure seems only slightly better. Furthermore, the point of desired temperature is hard to hit: 100% hot, 30% cold. 29% cold too hot, 31% cold too cold. Why such a fine tolerance on a new valve?
Can I replace with pressure balancing system without major tile destruction (It's old and hard to match)?
Can I do anything to diagnose the problem? I live for a decent shower.