soft brakes - why?

[Kegracing]

I have replaced entire brake system on my 67 Firebird. Wilwood disc on all 4 corners, new Wilwood 1" bore mastercylinder that they recommended, Wilwood prop valve. Most of the hard lines are new, and replaced the soft line in rear, and put new braided lines to front wheels. I have checked all fittings, and no leaks.

The brakes are soft. I can pump them up, and get some pressure, and it will stop car. I have the new prop valve with the pressure switch built in, and it is getting pressure with only one pump, but I am not sure how much pressure it takes to make switch. I do not have a gauge on the system. I have only driven it slowly up and down street in neighborhood (open headers, etc. gets lots of attention) to check brakes, bed new pads, etc. I have bleed the lines, and got good clear fluid out - no bubbles (with the new system, there was not any old fluid left anywhere).

Feels like I need to bleed them again. I just wanted to run it out her, and see if I am missing anything.

Thanks in advance.

Ken