It's difficult to describe the behavior, I considered making a video.
So if I have the quad connected to my computer and Librepilot open and I go into ESC calibration, following the steps linked above I get weird results. If I have the min and max set at 1000/1900 and arm the quad with the sliders at 1000 then slowly move them up the motors start spinning somewhere around 1100 iirc and the RPMs keep increasing they hit max at 1300. Moving the sliders further to the right does not result in the RPMs increasing at all. So when I disconnect that all and arm the quad and use the transmitter the motors hit full throttle by 1/4 stick. This results in the quad shooting skyward almost uncontrollably. My logic was if I reduce the max to just a bit over that 1300 result it would smooth out the throttle response and in practice that's exactly what happened. Instead of hitting max throttle at 1/4 stick it got to max almost at full stick. Unfortunately it did not have enough thrust to get any higher than 12".
I have also learned that the ESC's may not be EMAX at all. They came with a Hobbyking Black Widow and aren't labeled. They may not even be 20 AMP.