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The booster change ended up fixing my brake problems.
Car off pressure was a function of air in the lines. After some more bleeding at the rear T joint and brake bias I ended up seeing pressures in the 1100+ psi triple pumped and stomped.
The bad booster showed some interesting problems. I would pump the brake and stomp on it spiking up to 1400 psi. Then the pressure would bleed off around 50 psi a second until settling at around 900 psi. This was an indication that booster was unable to keep pressure on the brake system properly.
After replacing the booster I was starting to see 1800 psi pumped pressure with it dropping maybe 50 to 100 psi after a few seconds. A quick un-pumped punch was in the 1400-1500 range with little to no bleed off.
Seeing as I have no completed two double race weekends and a test day with the new brakes I am going to declare the booster the culprit.
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