What can I do to resolve an issue with a bath faucet directly running while the shower diverter stop is engaged. It causes a seemingly lower water pressure from the shower head and spills all the water directly to the drain?
Re: Shower pressure
Replace the diverter spout.
Take the old one off and bring it with you to wherever you buy the new one, because there are various configurations.
Remove the old one by using either a strap wrench, if you have one, or by using channel locks with the jaws cushioned by cardboard.