I think Sentry should go back to the earlier phase where he had the long unkept beard, was even less stable, and still thought he had killed his wife.
His powers shouldn't be clearly defined, but it should be obvious that they are WAY up there. That way everyone is always uneasy around him. Any low showings could be explained as Bob not having a good grasp on the power; but if he ever fully lets loose- LOOK OUT.