New brakes suck

[bmfm64]

Hi All,
Quick run down on the truck is I rebuilt the entire truck and got it to 95% just before last summer. I spent the summer driving it but I did cautiously. The entire truck was disassembled and every nut/bolt was gone through. I did a 5.3/4l60e swap and added a 12 bolt posi to it. The truck is a 70 SWB on a custom suspension. I also ran new brake hard lines front and rear and added stainless steel flex lines through out.

Now for what I'm here about- The brakes suck. I used the CPP front brake setup as well as their 12 bolt, bolt on rear disc swap. For the booster, I used a 7 inch dual diaphragm chrome guy off ebay. I had a ebay special master cylinder/prop valve but have since swapped it out to a Wilwood universal M/C with a 1" bore. Seen here- https://www.summitracing.com/parts/WIL-261-13269-P I have bench bled the master a couple times, and both regular foot and power bled the entire system a few times as well. No leaks in the system at all but I still have a soft pedal and can get the pedal to go to the floor. Any ideas?!?! I'm wondering if the bore size needs to be increased possibly?

I'll try to add some pictures but am pretty rusty on forum picture posting.