grover high has been an issue with alot of people it seems by all the post about it being able to find enough zeds to kill to complete the quest...
Enough zombies spawning for clear quests has been an issue for big servers over the years simply because the game has a max allowed zombies cap. If that number is reached new zeds wont spawn untill some are killed off. So..
one fix for this HOWLUNE did couple years ago was to add a delay that would add more zombies to cear quest to ensure there would be enough spawned to finish the quest..
<ByHowlune>
</objective>
<action type="SpawnGSEnemy" id="SleeperGSList" value="1-2" phase="3">
<property name="delay" value="120"/>
</action>
<ByHowlune>
i really think the pimps need to add something of the sort.. would solve the issue....
basically after a set amount of time doing the quest the game would auto spawn a few extra zeds to ensure a player was able to complete it..
simple idea - simple fix
its not rocket science.