I know we're usually taught to not mix different kinds of heads on the same zone. For instance, you normally wouldn't want to put a RB 1804 spray head on the same zone as a RB 5000 rotor. And you normally wouldn't put a MP Rotator on the same zone as zone that was otherwise 1804 with regular nozzles. Matched precip. rate is usually desirable. But I've found certain cases where it was NOT desirable. Where it actually created problems and the solution was to change out one or more heads to a totally different kind of head that had a lower precip. rate. I just wanted to start a discussion. In your experience, what circumstances is it acceptable to throw in different heads with totally different precip. rates within the same zone? Or if you think that's never acceptable, tell me why.