Front-rear line pressure bias

[woody80z28]

Converted my Beretta to rear disc and the stock master gave me 1400psi front, 500psi rear. Swapped in a Lumina rear disc master and it brought the rear pressure up to 950. 1400/950 still seems like a pretty big split, considering the caliper pistons in rear are also smaller. If my math is right, the 2.241 front piston creates 5516psi at 1400 and the rear 1.335 piston creates 1320psi. That's a pretty big split and there must be proportioning built in, because there are 4 individual lines coming out of the master that go directly to each corner. The Lumina master I thought would be a good match because the front/rear caliper area is 4.28/1.486 compared to my 3.94/1.39 setup.

Has anyone with an adjustable proportioning valve checked your front/rear lines pressure after you have dialed it in? I'm just curious to see what your split ends up being. And if a traditional disc/disc master has the same pressure out of both ports without a prop valve? It seems to me that I should have more pressure in rear due to the piston being so much smaller as well.