Stock 4 wheel disc mastercylinder

[chpr1972]

I have Wilwood 12.88 rotors, 6 piston calipers on front and 12.88 rotors and 4 piston calipers on rear and 1" Wilwood mastercylinder and Wilwood single outlet proportioning valve, on my cruiser 66 Lemans. When I put this together, about 2015, I bought what Wilwood recommend. This combination worked till recently. I do not know if I got weaker with age [76] or maybe glazing on the brakes. The car now requires extreme effort to stop it in a panic stop! When I called Wilwood, he told me I should have a 7/8 Mastercylinder on my car. They cost between $250/$300 for a new one. What is a "stock option that does not cost an arm and a leg? I do not want to go with power or hydraulic or electric as I am not nimble any more and hassle of crawling under the dash. Since I rarely have been in a panic stop situation, the other day was first on I remember, I do not drive it performance hard any more. Right now, it requires little PSI to stop the car in normal traffic