You say you have realigned the caliper but can I ask how you realigned it?
If you just loosened the caliper off, pulled the brake lever then retightened the caliper then that could be the issue
If the pistons are not pushing out equally and squarely then this can cause the caliper to not be aligned properly when trying the above method and can cause uneven brake pad wear and give off resonance
Best bet is to remove the caliper, then remove the pads, pump out the pistons a bit, give them a good clean with isopropyl alcohol, then push them squarely back in the bores (using a blunt plastic tool like a tyre lever as not to damage the pistons)
Next refit the caliper (minus the pads) and centre it over the rotor by eye, tighten down making sure it doesn’t move, then refit the pads and pull the brake, the pistons should move out squarely and the pads should then evenly touch the rotor and not rub or cause any resonance
Also worth checking your rotors are true and not contaminated