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I thought i had a really warped bed initially when i got my CR-10s and went thru the same thing with ikea-mirrors etc...... Your description at least sound like my initial experience..
The actual cause of why it was warped was not a bad bed but that i had applied too much pressure applied on the 4 corners, causing it warp.
One thing i would recommend you to do is unscrew all leveling-screws and then to get a really straight ruler and then put it flat on the bed and shine a light behind the ruler to see if you have a gap anywhere... If you do then you do have a warped bed.. If you don't you might just need to change the way you level it.. You might be able to use parts of my below leveling procedure to force it flat(er)...
What i did to get a my bed flat.
This allowed me to get a flat bed without any warping, but it was not as stable as i wanted it to be and that required me to print at lower speeds.
Since then i have swapped out the bed-springs for silicon standoffs that do not require as much pressure for getting a stable bed. If you are looking for some go for stiff ones with as large diameter as possible, while keeping clear of the insulation, and don't worry too much about the height since you can always add some washers.
I have also redone the cable-guide for the hotbed so it's completely disconnected from the bed-leveling screws since it caused higher tension on that corner. (drilled a separate hole to attach it to in the carriage.)
This was my story with what i thought was a warped bed... Maybe you have the same issue as i had and this helps, and if not it might help someone else.
** Tried to keep things as simple and as descriptive as possible for other people that may be new into 3d-printing out there...