Brake rotors for KH factory brakes made by Centric - critical review

I presume that the new distribution valve from In-Line Tube is faulty, so my next try is to send the original valve to a place that rebuilds them and swap them out. Other suggestions?
The 2 cars I drive a lot are a 68 cuda and 64 Valiant. Drivers NOT show cars.
I plumbed them eliminating the factory distribution valve. (Dual MC conversion on the 64) If I have a leak somewhere, it is pretty obvious without a red light telling me so.

I run the front brake MC output to a brass tee on the frame rail. Then one line to each front brake.

I run the rear MC output into an adjustable proportioning valve on the frame under the firewall, then to the rear brakes.

Simple and is adjustable for any future brake upgrades.