SPRINKLER TALK FORUM - You Got Questions, We've Got Answers

We recently bought a home in Florida [8D] with a sprinkler system which has been in the ground less than nine months. The back yard has six K-Rain rotors (no model number on the rotor). One was practically laying on its side near the lawn surface. This one is slightly lower than the others due to slope. I dug it out and down to the flexible pipe connection. After flushing, the hole was flooded and the soil stayed wet. After putting the original soil back and trying to pack the rotor, it does not seem very stable. A concrete ring was added which may help. What is the best way to stabilize a rotor in sandy soil? Should the removed sand be replaced with better soil or gravel? Or is there a trick for packing the sand back around the rotor? The other rotors are not tilted as much, but all are spraying towards the heavens, and in my inexperienced opinion, need adjustment.