[BigLew]

Try an extended flushing with a salt removing solution. (Out of water and running in a tank for a while.) It could be that you have enough salt/crud build-up to restrict max flow. Just an idea and a cheap "fix."

You might also add a second run using a mix of H2O and white vinegar. The mild acid will tend to dislodge/ disolve mineral deposits as a result of higher alkaline water sitting in the warter jackets between uses. I shouldn't harm any of the surfaces.