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You need 2 lb. residual pressure valves in both lines. On under-floor MC installations, the fluid can back away from the wheel cylinders. Another method is to use a non-vented cap on the MC. I prefer the RP valves, though. RP valves may not be the whole problem, though.

Do you have the proportioning valve in the line to the rear? If not, you have no hope of adjusting, since the prop valve only reduces pressure.

Also, I believe you have the lines reversed. Mounting the MC under the floor reverses its normal position. That means that the foremost port (nearest the booster) needs to go to the rear of the car, and the rearmost port (furthest from the booster) needs to go to the front.

The attached photo shows the MC in my A-bone. It's not power, but the same theory applies.

The MC in my current project is mounted on the firewall, The front port goes to the front, and the rear port to the rear.

I'm not sure if this would make all the difference, but they set them up that way for a reason.