TreeCo, the significant difference between your setup and the setup Tod K is running is that your friction hitch is taking all the weight while his is not.
No matter what sort of friction device you're using (muenter hitch, 8, etc.) and friction knot (prusik, VT, etc.), it often makes good sense to locate the knot below the device because you will be utilizing the strength of the device and requiring less of the knot. Someone earlier mentioned his prusik getting locked up; moving it below the device will solve this problem.
I learned that from a climbing book (I believe the title is From Gym to Crags, published by the Mountaineers). All the other sources I've looked at put the knot above the device, but locating it below makes more sense to me.
I like how you've rigged the delta down low on you leg strap; that seems to keep the whole setup closer to you.
Shayne