If you look at the actual structure definition for D3D11_BUFFER_SRV, you'l lsee that ElementWidth and NumElements are in a union. So you can't actually set these values separately, since the occupy the same place in memory. Honestly I have no idea why ElementWidth is in there, since I've never used it for anything. You'll want to just set NumElements to the appropriate value, and leave ElementWidth alone.
Thank you MJP (Again ), cleared things up perfectly and plugged a knowledge gap of mine!