I have a system I'm maintaining, (not my install) that has 2 drip zones. One of the valves will turn on, but not stay on. Pretty sure it is because this particular zone has very little output on the drip. I understand the way valves work and know this happens, but have never run into it before. The valve was a Water Master (Home Depot valve) and I changed it to a RB DV-100. It worked fine after I changed it, but it's doing it again. What can I install to make this work properly? Will changing the top to a DVF and crank down the flow control a bit take care of it?