Im having trouble ingesting these logs with the following format:
Splunk is having issues with the content of the event and the time stamp. Any help much appreciated!
MAXTIMESTAMPLOOKAHEAD is property to indicate how long the timestamp field/value can be. E.g. in your example its 13 (no of digits in epoch time). If there are milliseconds there could be decimal point and 3 more digits. So it would be good idea to set this property to avoid capturing extra values. But since your timestamp is the last field in your event, it may not be necessary.
Depending on the size of your log entries, you may also want to add
MAX_TIMESTAMP_LOOKAHEAD to your props.conf file.