Looking for a simple fix that may not exist, but here it goes anyway. Got a typical shower & faucet setup. Pull knob on the faucet. I hear people talk about having water flow at the faucet when in shower mode, but I'm having the reverse problem. When in faucet mode, I have water flow coming through the shower head. Thus, a wet head when tring to run water in the tub. I've installed a simple in-line cuttoff at the shower stem to choke off some of the water flow to no avail. Changing shower heads hasn't worked. Is there something else I can try, maybe a pressure valve at the stem instead of a cuttoff??