The so called bias is the reservoir volume(from what
I have been told)... nothing to do with valve bias...
if you look/measure the bore of the master you will
find 1 bore size in there not 2 which would change
the bias... I have been running the alum master on
both my race car and my street rod without any DIST/error
in system valve for years... on the race car I have
disc/disc but with the lines on the master reversed
for the volume(front reservoir to the front brakes, rear to
the rears) with a adjustable valve(prop valve) on the
front brakes.... reason its on the fronts.... the
small tires CANT take the brake force that the BIG
rear slicks can on a pedal spike... quick lesson...
the adjustable prop valve JUST SLOWS THE FLUID...
given enough time the pressure will equal out... so
with the prop on the front tires it slows the spike
and allows the rear tires to do MOST of the braking
(and YES I did work in the brake lab for Chrysler
for some time)... but MOST of my time was in the
fuel and exhaust lab

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So, are you telling me I should go ahead and try the suggestion about running without the Prop. valve? Plumbing the way it's suggested in my org. post? Or just letting me know how you've done it, and it does work (for you at least!).