It is time to "Take a Break" before "Working on your bicycle Brakes"... otherwise you will "Break your Brakes".
If the brake lever stops the wheel or can skid the wheel before the lever bottoms out, then I doubt you need to bleed the brakes. What about lever movement before the brake starts applying?
Oil on the rotors is bad.
Are your rotors bolt-on, or some time of spline attachment? If bolt on, are the bolts on the rotors tight? Without breaking them, of course....
Also slowly spin the wheel to observe whether the rotors are true, or wobble. They may be able to be trued if they have a wobble.
Dirty rotors?