Help, I had 2 Rainbird T-40's rotors. I was having trouble setting the watering angle. So, I got 2 Rainbird 5000's and replaced them. but, now right in the middle between the 2 new rotors I have a dry spot. The sprays over lap each other. I tried every sprayer nozzle given me and cannot get enough water to fall in that spot (it's about 8 ft circlular). I see other lawn systems that look like walls of water falling from the sprayers, but mine just seem to spray out about 25-30 feet without droppi...