VLC player doens't have support for DXVA, IIRC. 70% load isn't that bad but here is a great tutorial on using DXVA with a program called MPC-HC (Media Player Home Classic) one of the best programs IMO for HD playback. I like it more than PDVD9
Tutorial : nunnally.ahmygoddess.net/watching-h264-videos-using-dxva
You might also want to try PDVD 9, in MPC-HC I don't think you can play BD's right off the disk.