I would just bend it back but CAUTION! there is a printed circuit board heater on the other side and it is somewhat delicate and if you bend the metal plate too much you can add a crack to the heater and it will no longer heat up.
I have personally bent the rear corners on purpose to make things flatter (to compensate for slightly thicker glass in the center) and I was lucky that I did not damage the heater. The heater will either work or not so it's not like you have to recalibrate the heater. Either you will break it and it will no longer heat up at all or it will be fine.
Those clips should be squeezed with some pliers to have a slightly smaller gap than the width of the glass.
When removing the glass do not lift the front edge up any more than necessary to slide the glass out. Many people lift the front edge of the glass much too far and that pries the rear clips open. Which is bad.
The stiffness of the glass is similar to the stiffness of the bed for the first 1mm or so of bending. Meaning the two surfaces (flat glass, bent metal bed) will end up somewhere in the middle when attached together.
I disagree with Dustin and think the rear screw has nothing to do with it. I could certainly be wrong.
Wow.. that's one seriously warped heated bed!!
I would recommend getting that machine looked at by your local reseller.
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