It sound's like you may have some trapped air in the sys.
Are you getting a good amt. of fluid out of all bleeder's ?
No more, no less out of frt. than rear ?

If you are getting more out of one system than the other, then the system (frt. or rear) that's producing the least amt. of fluid have someone pump the pedal to the floor once and open one of the bleeder's tehn close release pedal and repeat until a good amt. of fluid come's out of the bleeder then go to other side and once you get a good amt. of fluid coming out of the bleeder's then bleed as usual when doing so you only need to pump the pedal no more than 2 times.

Remember to wait about 15 sec. between each pumping procedure.

Then if that work's return to the m. cylinder for a final check of any left over air and this can be done on the car.