I had the 2 0.75 and the pedal felt good but there was no pressure at the calipers I have now got a .625 for the front and .7 for the rear now the pedal is a little spongy but the brakes are there just they won't stop you in a hurry tho I have got to do something with them I am scared of driving it incase I run in the back of someone I am at a loss as to what to do next I am thinking about binning the braided hoses and putting copper pipes it would be nice if all the kits had the same brakes on them would make eliminating stuff a lot less hassle
did you try switching the master cylinders around?
0.7 for the front
0.625 for the rear brakes
by the way, my car had zcars flexis all round (the blue ones). No copper pipes...