New member here looking for advice. I just bought a home and would like to switch out the showerhead for something with the best possible GPM. Taking all attachments off the shower arm, I get 4.9 GPM once I attach the Dual diverter which is an old Moen it drops to 3.5 G.P.M. I bought a Speakman S2251 which is the 8 sprayer head removed the restrictor and attached directly to the showerarm. It drops to 3.2 GPM so 2 questions. Is there a showerhead out there that will allow more than the Speakman through (possibly its the showerheads very design that can't handle more than that or possibly my water pressure isn't enough to force it through even though my water flow is good) secondly as I would like the use of the handsprayer is there a diverter that wont impede the waterflow at all. Thank you.