DB question for Symantec Endpoint Protection

We created a database on SQL Server 2008 for Symantec Endpoint Protection. Looks like it created 5 data files and 2 log files.

For some reason, the log files kept growing even with hourly log backups. I was able to do additional log backups and issue DBCC SHRINKFILE (log1,2) and DBCC SHRINKFILE (log2, 2). However, most of the time I will need to re-run an extra log backup before issuing shrinkfile for log2.

My concern is, my hourly log backups aren't backing up one of the 2 log files. Is there a different way to do log backups other than issuing the following command:  backup log sep to disk = \\unc_path with init, nounload, name = filename, noskip, stats=10, noformat