Switch over to 1/4 turn ceramic valves?
And try to get them to understand that the valves open & close based
on position not tightness.

cheers
Bob

delta single handle faucets work awesome great, the only trouble with
them the mean time between faiures, drips is so long perhaps 8 to 10
years i forget the service tricks..

i rarely think of them, they are affordable dependable and cannot be
over tightened