I guess I replied before I refreshed my browser.

I think Tommy hit the nail on the head. I am running the prop valve that came with the MC. I think the problem may be that the Mark 7 rear calipers are bigger than the SN95 ones and may therefore need a different bias setting requiring a manual valve which fortunately I have a Wilwood unit.
I added an 1/8" shim to the spring in the existing prop valve to hopefully swing the bias back to the front some but as it is Monsooning again the real world testing will have to wait till tomorrow.

Thanks all.