ABS delete manifold

Do any of you guys run an ABS delete manifold? I put one on my cobra when I switched to a solid rear axle and it does not seem like the back brakes are doing much work.

Did you have to change the proportioning valve? My pedal is also low as compared to before.

I have bled and bled and bled the brakes for the past couple days. I have fluid and no air. Just wondering if anyone else had run into this.