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Maybe the mdf has been exposed to moisture and warped ever so slightly?
If you can't find anything good enough at home, I'd wonder over to the sheet cutting section in your local builders merchant and see what's there, take your laser level with you and take the straightest offcut you can find?
I have eyeballed the 2.4m sheets I've been getting from Selco and they've been good.
Aluminium box section could be good, but I'd want to look at it before purchasing as there will always be duds. Builders depot perhaps?
Hovis
Even eyeballing it looks iffy. I also offered up the edge of a 1m metal level, and a frikken laser level.
It's not the most egregious of curves, but over 2.4 meters it's noticeable.