55.2-59 Braking Power

[57FleetsideC4]

Hi All, I finished my 57 pickup project this past summer (truck build in my sig.) and the one thing I do not like is the braking in I need more braking power. It has the stock corvette C4 brake calipers front and rear with a 1" master, 4 wheel disc proportioning valve, 8" dual diaphragm booster with 17" of vacuum to it. It stops straight and even but if I had to panic stop I would be in trouble. It has a good brake pedal feel. Anyone run into this? Thank you Steve