available physical memory lower than total

It does not matter how many weeks we let SQL run without reboot, etc. We do have some long running queries which I believe would be helped if the instance would use more RAM. It almost seemed like we had SQL Express memory limitations in operation, and I have triple checked that the server believes it is Standard Edition. We have the minimum server memory for the instance set at 30GB. I get 1956MB in use, and 1501MB locked pages. (total_virtual_address_space_kb/1024) AS Total_VAS_in_MB,

(physical_memory_in_use_kb/1024) AS Memory_usedby_Sqlserver_MB, I have read how Task Manager is not accurate in reporting SQL memory usage so I ran: The other is for a security system (door badges) and performance isn't important for that instance. One of the instances has the databases for an ERP application called Foundation, and we would like it to use a lot more RAM. It's sitting at 56GB available as I write this. It tends to use about 5GB to 8GB total for OS and both instances as reported in Task Manager > Performance tab. We have a 2012R2 server with Standard Instances.

Available physical memory lower than total