Finally got round to reading this - your Bots loop is almost exactly the one we did in 2002 - we saw lion but no leopard. Linyanti is my absolute favourite spot - when no-one else is there!!
Our Hunters Road trip then was also devoid of wildlife but for one hyena and one ele. A badly-programmed GPS saw us wander (in the dark) between the red posts (old railway sleepers) and into Zim - did about 15 klicks before we figured that out, and skedaddled in a hurry, and on down to Nata Lodge, who were starting to get worried about us
Pity you missed Mankwe Bush Camp, near Khwai - very pretty (run by the Sankoyo Trust - the road sign you show pointing left to Khwai and right to Sankoyo didn't exist when we did that trip, so we got misplaced for a while then too - all in the fun of things!!!)
If you head that way, and look for accom. on the Livingstone side, you can try Thorntree River Lodge (
http://www.thorntreelodge.net/) and also Chundukwa River Lodge (
http://www.chundukwariverlodge.com/pages/factfile.html) which has (or had) a 4x4 campsite a little bit upstream from the Lodge where you can self-cater on the banks of the Zambesi. Great guys there - got us down to the White Water Rafting section (great day - SWMBO hated the climb back up the gorge - very jealous of the guys who choppered down to the ject boat and then back out again

), Flight of Angels in a microlight over the Falls and Ele Riding in Zim, as well as horse riding and a trip into Livingstone itself ... to be recommended.
Sorry about the Lions - you'll just have to go back and search the desert Lions of the Kalahari out ...
Damn - I feel like packing up right now ...