I just installed the trim and shower heads on my new remodeled double shower. My plumber installed the rough in delta r10000 valve and the delta r11000 diverter. I just installed both shower heads and both the trim kits for the valves. When I go to turn on the water, it comes out at a decent rate, and then slows down. When I turn the diverter to the other shower head, it does the same thing and when i turn it again so that both heads are on, its almost nothing coming out. Both shower heads are 2.0GPM and I also turned the temperature as hot as it can go. Any help?