Thought I'd leave an update.. thanks for everyone's help. I have figured it out. It was as my cousin said, by having all the zones on at the same time, the water pressure to each zone wasn't enough so I wasn't getting a full stream. When I searched online yesterday I saw the suggested PSI (40-55) for rotor sprinklers. .and it was evident that could easily have been the case (from my visual PSI meter).

So I put on the zones 1 at a time.. and water out of all sprinklers.. even found some more I didn't know were there.. :-)

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2005 LeMans Blue e53 4.8is
MODs
///LeMans Blue RBs///Intravee II///Sirius///ACS Spoiler///AiB v3///HID Fogs///LED Tails///
///215 20" Ferric Gray///MTEC Pedals///DVD Headrests///SMG M Wheel///AFE CAI Stage 2