I keep forgetting to send you may setup - however calling the Merc soft is a tad inaccurate! My biggest fight with it has been softening it enough to actually get the wheels to stay on the floor
As for the ABS, it's rubbish - you can go much faster if you turn it off and just reduce the brake force to 90-95% (do it to suit your own driving).
Don't compare your braking with that of the Fords BTW - they have insane brakes, I couldn't do anything to stop that effectively hence why they have a slower-than-you'd-expect top speed.
I don't have an Avus setup yet but will upload my Nogaro one for you later tonight - I have to upload some cameras anyway
Isnt softening it causing more body roll and lifting the inside wheel?