MVC localhost does not use SQLSERVER security database

Running my MVC website picks up my users held in SQLSERVER security tables (e.g. dbo.userprofile) fine (using the DefaultConnection string and pointing it to my SQLSERVER DB).
When using ASP.NET configuraion from the Project tab within VS, it picks up either the SQLEXPRESS security MDF file from the AppData folder or (if I add membership and role providers in web.config) it uses the older type security tables (e.g. dbo.aspnet_Users).
Is it possible to get the 'ASP.NET configuraion' utility to use the MVC security tables?
I tried changing machine.config default connection string but it made no difference.