Leave all the geegaws at home (muzzle brake, spotting scope). Borrow the scope offered or buy a good Burris Fullfield II BDC in 2-7 or 3-9 from ebay for $140-$170. You're not going on a long-range sniping mission. Your PH will get you close to your game, that's what they do. Take the '06. Buy the good ammo suggested with 165-180 grain premium bullets. Practice shooting and learn your rifle. If you have shooting sticks, use them. Chances are good you will be shooting off sticks in Africa and they work great. Your PH and his trackers will take care of you.
When I return to Africa for my next safari, I will seriously consider leaving my binocular at home. The folks there see so well and know where to look to the point I very seldom had time to use my binoc.
Pack light. Take a couple days change of clothes at most. At the end of the hunting day, I came back to freshly washed and ironed clothes I had worn the day before.
Use the rest of the saved room in your luggage to take children's clothes as gifts for the PH and the trackers. Chances are they have kids and will appreciate the gift. Also, ball point pens and small razor knives (pack these in non-carryon luggage) were appreciated by the trackers. It seems they were all amateur artists and taxidermists. And the pens were sort of a status symbol for the trackers.
Enjoy your trip. It will be a great adventure.