Redid the test on Governor pressure:

Seemed to be closer to 0psi at rest - maybe a couple psi.

Again inconsistent numbers like the line pressure.

Could get 10, 15, 20 psi matching mph at least close to. Only saw as high as 25psi, then drops off. Went as high as 45mph, and stayed around 20psi. The pressure was not consistently following at lower speeds either.

What else affects governor pressure besides the governor itself and the sealing rings? I did not replace the sealing rings, though they weren't visibly worn or broken.