Squishy breaks, bled all about 5 times

Just as the title says, I recently changed my brakepads and my rubber brake lines bled all of the wheels and the master cylinder. I went to take it out for a spin, and while it was off everything felt stiff and good to go, but when I turned it on I had to press the brakes 75% to the floor to do anything. I thought perhaps I did not bleed the brakes correctly and I did it again. The same problem and nothing was fixed. I have bled the brakes 5 times now and even changed a caliper to no avail. I looked for leaks but there was nothing. Any ideas? and thanks for any help.:Wconfused

p.s. sorry for the bad spelling in the title haha