Spray heads provide maximum coverage closest to the nozzle, and less as you get farther away. Head-to-head coverage is used to compensate for this effect. Overspray isn't usually a problem, it's underspray that is. Can you elaborate on the problem...it's not very clear what you're asking.
10 PSI would not be able to pop up your heads, you would have to use fixed heads. How do you know you need 10 PSI? Sounds like you are guessing and could be way off. Better to use Toro Precision Spray Nozzles which tolerate anywhere from 20-50 PSI and have an adjustment screw for up to 25% radius reduction.