I installed an American Standard tub/shower valve about 5 years ago. My wife has hated it since day 1 because it has such a low flow. Takes forever to fill up the tub and the shower head flow is very low. I called AS and got a new replacement cartridge, no improvement. The second bath that backs up this one has a "no name" shower valve and so much pressure and flow it will peel your skin off and fills the tub in no time.
Any suggestions or do I just replace the whole thing with another brand and hope for the best. Supply lines are 1/2 copper.