[keycloak-user] LockAcquisitionException against SQL Server

We have started a load testing effort against RedHat SSO 7.1.2, using a SQL Server data source. Our datasource pool is set to min/max of 10/30. With a load of only about 5 concurrent users, we start experiencing LockAcquisitionException errors on user creation or access token building. This results in the load test failing for a large percentage of users. Any recommendations on where to look for resolving this issue? Perhaps something with the data source configuration? Thanks!