Hydraboost brakes

[XSS 454]

Hi guys I've recently fitted a hydratech system with the cpp m/c and couldn't get a pedal no matter how I bled everything, anyway after rebuilding the m/c and still no pedal I gave the cpp unit the flick and now have a wilwood m/c, although the pedal is better it still goes about 3/4 to the floor before working. Now trust me Ive done a sh1tload of research via the net and have tried everything recommended, I've triple checked everything, leaks, pedal rod length, calipers, wheel cylinders etc. you name it and I reckon I've done it, bled the system for hours and hours, but still not happy.
The car is:
68 camaro
BBC
Disc/drum setup
Standard gm type prop. Valve
Hydraboost system and m/c as recommended by hydratech

Any ideas would be appreciated
Thanks Brett