So I thought that since I put in sprinklers for two summers during college that I would be able to install my own system. I have a really small yard and this is my problem. One zone has 8 sprays and the sprays come up and spray and water what they are suppose to but it could be better. My big problem is I have one zone that has six 3500 series head with number 3 nozzle in them. I am using a JTV-100 valve and at 40 PSI and was getting 3 GPM. The six heads come up about 1/3 way out of the ground and just spit water straight in the air. HELP!