I'm somewhat confused. You instructed the driver with UseEDID false to not use 
EDID and the the driver still selects the 1280x1024 @ 60 Hz? Have you tried to 
use a modeline? Perhaps a range of (correct) vertical freq. instead of a set 
number?
Please check also the ModeValidation option. I see some interesting options 
there (for instance AllowNon60HzDFPModes).

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unable to set proper screen refresh rate
https://launchpad.net/bugs/92599

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