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Hello, I'd be happy to help! First, what did you use to compress the pistons? Can you post a picture of the caliper showing the piston? If they won't go back together due to clearance it's either 1:the piston can go in farther or 2: bad parts. Do you have access to a digital caliper to measure the rotors and pad thickness? I can look up the ideal measurements for those parts and determine whether it's just too thick.
wrong pads, i would go with a different brand of pads. i have had this a few times where a different set fits perfectly