Single streams can work fine. If you are not replacing all of them at one time, be sure the nozzle of the new head equals the gpm of the old. If you are replacing all of them, a design check may be in order to see if system efficiency can be improved. Harold
Mixing sprays with rotors is not a generally accepted practice. The precipitation rates vary too widely. Typically installed residential rotors will yield a precipitaion rate of .3-.4+ inches per hr. Sprays ofter run 1-2 inches per hr, generally averaging 1.5 in/hr. The best solution is to install a Hunter I20 or PGM (or equal) rotor with a very low gallon nozzle proportionate to the arc and radius to be covered if at all possible. These nozzles can be squeezed down in the teens of feet and run ...
