I spent 3 weeks in Chewore with Hunters Safaris back in May '94. Don't know how it is now, but back then it was full of very fine animals. Pity you don't have more time, it was 17 days of hard hunting to find the elephant I took.
I hope you're in shape. It is pretty rugged terrain, and when tracking jumbo, you can put 30 Ks a day on your boot leather.

Have fun and good luck!
SOS