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If the image is sharp in liveview I wouldn't think that the filter would be the problem. Are you taking these as raws?
Also perhaps you could take a shot of the moon and see if you get the same softness..?
I haven't used mylar film but during the transit I chucked some of the viewing glasses in front of my lens (on a 7D) and those images were reasonably sharp (perhaps a bit sharper than yours but much smaller).
As for seeing the screen, perhaps you could chuck a black cloth/towel over your head and the camera body...?
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