I had the same problem with my stock front disks and empi rears. Just couldn't get things right. So I did the best thing, got rid of them and put on the Boxsters...
But, this should solve most of your probs till you can spend the bread for the Porkers:
http://www.cip1.ca/ProductDetails.as...13%2D16%2D9554
The 944 MC on the stock disk/empi setup will be horrible. The pedal effort will be huge! Unless you really need it I keep the master as small as possible to improve line pressure. (I'm using a stock 19mm on my Boxster S brakes with amazing results).
Lanner