Geeetech

I have a MeCreator 2 and it appears to have a bend in the printer bed gantry. I have to have the center middle screw so tight that there is no spring in it. Where the front 2 are almost unscrewed and i still can not get the bed level. when I put a level on the gantry it shows that it goes down hill from rear of the printer to the front of the printer. Which make sense with the way the screws are set. Any one have any suggestion on how to level this printer bed?

Thanks