As I said...
High memory use by SQL is normal. Hence not a cause for concern.
SQL can and will use memory outside of the buffer pool (which is what is controlled by max server memory). This also is normal and not a cause for concern.
Gail Shaw
Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability