The agent manager task only executes every 30 minutes by default. This is why the "when created/modified" agent runs every 30 minutes. You can change these two lines in your notes.ini file to decrease the delay between runs of the agent manager:
AMgr_DocUpdateAgentMinInterval=value in minutes(default is 30) Amgr_DocUpdateEventDelay= value in minutes (default is 5)
The lowest values recommended for these two values are 5 and 2, respectively.