Is there a question in there somewhere, Harry? There's something to be said for plain, direct speech, you know.

Not sure I understand what you are driving at. Are you saying the available figures are all too small for your purposes or that all you can find are literal pygmy witchdoctor figures? Not sure I've even seen any pygmy ones, and there are a fair few that aren't. Without knowing exactly what you are asking for it's hard to respond.

Anyway, if we're preceding under the assumption that you are looking for 28mm Witchdoctor recommendations, then the obvious answer is the Foundry pack from the Darkest Africa range. They are standard 28mm figures, really. Not huge, but not small either. Copplestone does a couple of izangoma in his Ngoni command pack if you prefer something more Zulu-looking. North Star Africa have a guy in a silly mask in their Congo chiefs pack. He could probably pass for a witchdoctor. They also do a Matabele witchdoctor in their Matabele characters pack.
Hope that helps.