Went with Rainbird HE-Vans for the smaller areas and went with Rainbird 5000 rotors in the larger areas.What did you switch them out with? I'm running into the same issue with hot spots on the front and back yard.
Recently installed a Rachio controller (on sale at Costco + $80 rebate dropped my net cost to @$90 for it), but might have programmed it incorrectly as a few zones are not getting sufficient water. I have had to manually water zones here and there to prevent hot spots. Will need to tinker with it when I have time.