Dual Line Lock help

So i Installed 2 biondo rear line lock solenoids on the rear of my daytona. Its a racecar and this is to help car hold for the burnout.

The passenger side locks the tire up but for some reason I can not get the driver side tire to lock up. When I jack the car up i cant move the tire by hand but when i set the car down, at idle the solenoid doesn't even hold the tire. Here is what I have done:

1. Bleed brakes several times
2. replaced caliper and banjo bolt
3.replaced solenoid
4. I knew the pass side was working so I disconnect it and wired this solenoid to those wire but no luck. So it isnt a wiring issue.
5. New master cylinder has been installed

The only thing I can think of is that maybe proportion valve went bad or I need to replace the hard brake line and both hydraulic hoses. But by visual inspection everything looks okay and there are no leaks and brake pedal feels rock hard.

I'd try the hoses. They collapse internally and then do wierd things.