NO, I don't think mixing PGJ and sprays are a good thing. The application (precipitation) rates are not he same. You will flood some areas and starve others. As far as the too much water, just use the deflector screw to adjust the radius, or use a low angle nozzle instead. If you have to switch to a different nozzle all together, just adjust your pressure switch on your pump to stop the cycling, or better yet install a Cycle Stop Valve ( www.cyclestopvalves.com/video/pbs_2006-dsl.wmv ) ( www.cyclestopvalves.com/products.html )
Josh
Irrigation /Landscape Lighting / Pump and Well Specialist