Here's a bit of an update. I had the car out a couple of weeks ago in Tucson for the AZ Stock/SS race, but got sidelined by an electrical short that took out my tach, shift light, brake pressure gauge and line lock, because they were all on the same fuse. I ran without them in round one, shifting by ear but broke out.
Since then I fixed the short so everything works again, and I replaced the master cylinder. The one I had was 1" diameter and the new one is 1 1/8". That made a huge difference, I can now get plenty of brake pressure without the pedal ever reaching the floor and without pumping the brakes.
Now we're in Las Vegas for the divisional there, and since we arrived late in the day yesterday Q3 this morning is all that I got. Great air and a tailwind put me .62 under the adjusted index. It'll still take a while to get my staging procedure right but for now I'll bump in a bit and should have a chance in round one tomorrow.