Pete, I disagree completely with a 1-4 or 1-5. I think the 06 with 180 partitions is fine, ranges are not long at least on the two trips I went on. The second trip I took my old .300 and a 4-12 Leupold on it and a .375 H & H with a straight 6x. I planned to use the .375 just because I wanted to. I shot one waterbuck with it, and left it behind in room. Not because of the ranges involved, but the brush was pretty thick. The 12x allowed me to pick a good clear hole to shoot through. This might not work for the average shooter, but for an experienced rifleman it was excellent. You sound like you have plenty of history behind you and I feel it would be to your advantage to have the higher power to use when needed.
