The vacuum modulator reduces line pressure when load is light ( high vacuum ) and increases it when load is high. Your tests are with vacuum line attached but your specs are with the line disconnected so we can draw any conclusions from your data.

Buy the $ 30 ATSG service manual ( don't bootleg it as they put lots of effort in to these things. )

Did you air check this trans after it was built / before valve body was installed? This is a way to check for major internal leaks.