Well, since there's no evidence to support that Sauron chose the Witch-King for special gifts, such as a prime ring (or even that there was a prime ring), it stands to reason that the power received from the nine rings is primarily that irrational fear that all the Ulairi share. It also stands to reason that those things the Witch-King excels the others in ("more powerful in all ways") are things he brought to the table himself. He was a sorcerer and, evidently, a warlord before his corruption. It is therefore not necessary to assume that he received any abilities as a sorcerer--aside from further training, perhaps--from Sauron or from his ring since he is already identified as a practicer of those arts.
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