Restore Compressed Images and Setting Compression Rate

Hi! I selected to Super Smush on all of my images, however, I noticed on this page: the images (especially with graphics) are too fuzzy. Is there a way to restore those (I selected backup originals in the upload file, but not sure how to access that)? Also, can I change the super-smush compression settings to something like 75 percent rather than 60 to get a mix between great compression and image quality?