Make sure the signal line to the servo is shielded and that shielding is grounded at (only) one of the ends - the one from board. Do not try use the shielding for any other purpose. No caps on the signal line, but can try a good size electrolitic cap between +5v & Gnd placed right near the servo. Also you could try using a different 5v regulator to servo supply. Or make its own +5v supply from a local regulator.
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