You might also want to look at Jack Hume Adventures...
www.jackhumeadventures.com
I'm going up with them this September. Main reason I chose them was they have a small fleet of planes they own for themselves as well as a number of camps throughout the region. They never book all their camps up so that if some camps with hunters are unproductive; they always have the option to move them which they will at no cost (hence the self owned fleet of planes comes in handy).
I looked at quite a few, so I don't remember Explo Sylva per se; but I've seen a few programs where they were the outfitter... I doubt you would go wrong with either one... at least i hope
Cheers.