I just re-read your old post about your brake setup on my previous troubleshooting thread. Thanks for posting that. Sometimes I really need to hear that someone else with this setup has gotten it working.
You're using the 280Z M75 booster, right? Did you adjust the booster rod to stock spec when you installed all this stuff? Or did you have to run it out further?
Austin, your post is making me wonder if my only problem is pedal feel. Changing the booster should only change pedal effort, not travel distance, right? So, even with the firm pedal, do you have to push just as far as when it was lighter to lock them up?
Unless you also changed the rod length as a result of switching the booster, I don't see how it could have solved your problem....and I -really- want to solve mine. I can lock my tires up no problem, but it feels like too much travel and the pedal goes down way too easily, regardless.