My solution for this was to project the feature lines, then create a new profile line that follows along those projected feature lines. I then set the style for that new profile line to be a non-display style and then I have slope labels on my projected feature lines. In the areas between the projected feature lines I simply delete the slope labels I don't need.
That doesn't work unless the feature line is parallel to the alignment - because the grades in the profile view are not true.
It also does not offer any advantage over manually adding labels since both will have to be updated if the feature line is edited.
I was thinking, one way to do it would be to label the FL grade in plan and drag the label to the projected profile.
Just a thought here but what about creating a pipe network from that feature line and using a generic single line style. That way you could use the pipe slope as your label and it would be the actual slope. Obviously, if you have any curves or arcs this won't work but for straight segment it would.
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