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Putting this here because someone else probably had this problem.
Hope floating rotors are notorious for rubbing on caliper mounts because of those ridiculous rings they put in it. It's especially likely to happen if the inboard pistons are much more active than the outboard ones, causing you to have to shift the whole caliper inboard to adjust, which brings the rotor and mount even closer.
Cleaning and exercising the pistons might help to balance out the friction and hopefully re-center the caliper, but barring a full rebuild*, just get a different rotor.
*You do have the option of grinding down your caliper mount, but personally I am not down for that.
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