As a local hunter, I will always choose April/May. Remember that the local hunters make up more than 90% of game hunted in a calendar year in S-Africa. Traditionally hunting season starts in April/May and ends in Aug/Sept. So when you arrive in Aug, I think it is fair to assume, the best animals(of that season) have been harvested(either by locals, or overseas hunters). The rest of the game, normally are excessively "skittish" from being exposed to all the hunters, come Aug.
Just some local input
