I'd recommend taking a look at this video - How to Troubleshoot Syslog Nodes in LEM. Around the one minute mark, it covers how to use the 'checklogs' command to verify if the logs are hitting the LEM appliance. Can you run that command and check the appropriate facility to validate that the logs are being received by LEM?
Once you've confirmed that the logs are being received, we can then walkthrough the Procurve connector configuration.