I have made some calculations to check brake line pressure, I presume 75lbs (leg) pedal pressure is correct? times 5 for the pedal ratio gives me 375lbs on the MC. I would like to use a 5/8 MC to start testing (small pedal ratio and no brake booster) but if my calculations are correct this will give me 1221psi on the brake line and the willwoods take 1200 max. the question is, are my calculations correct? or do I miss something?

( 5/8 MC= 0.625x0.625= 0.3906 SqIn. X 0.7854 (phi/4) makes 0.307 SqIn. so 375lbs divided by 0.307 gives 1221 psi) am I forced to use a 0.7" MC to lower the brake line pressure because the calculations are correct or did I do something wrong? please, feedback required (ps a 0.7MC gives 974 psi with the same calculations)

thanks, Rick