68 Mustang brake problems. HELP!

[windsor]

I have a 68 with power front disc rear drum. It was originally a 4wheel manual drum car. I have done everything to the car, all ford stuff, just like in 68. My problem is that when I step on the brakes, they are sooo sensitive. If I were to step on them normal, to moderate, I would go through the windshield. SO I have to barely press the brake pedal to slow normally. Then my second problem is by doing this, my brake lights do not go on. I have such light pressure on the pedal that they dont even trigger. I have the correct pedal and support, master and booster, and dist block and proportioning valve. So what gives. I feel that if I had to press on the pedal with more effort to stop, my lights would go on. Any help is appreciated, and thanks in advance for all your help.

Brad