Bart, for what it's worth, I just checked an old Bushnell that has caps marked the same way March marks its caps.
The direction on these caps are for point of impact. The windage cap indicates clockwise is "left". I turn it clockwise and the reticle moves right, which would put the point of impact to the left.
This is part of why I stopped looking at lense cap instructions. I think your conclusion that the March instructions have it reversed is correct.
