I haven't done a whole deer ham. I have done whole deer shoulders. Are we talking about deer here, or some other type of wild meat? Chief Mac's method sounds good. Italian dressing also works well. I agree with the fat and bacon help. If you have the right injector system, you can mix pork fat with spices and marinade and shoot into it. You might be well off to cut the hind quarter into as large of boneless roasts as you can. If you get the pieces of meat too small, they will dry out worse. The biggest mistake most people make with deer is they overcook it. I have purposely overcooked deer shoulders before and then chopped the meat up like pulled pork. Not bad at all. You might just want to bone it out and then slice into 1/8" thick strips for jerky. Deer makes the best jerky.
Tom is correct, as always. Lots of info if you look for it.
Good luck, and let us know how it turned out, please.