I sometimes use a Lastolite Tri Grip Difflector for tricky harsh light problems, Sandy.
However . . . you have to hold it with one hand (you really need three arms) or have a second person to assist. I made a bracket with a strong clip which attaches to a second tripod to hold the Diflector. But that is more gear to purchase and lug around all day when on a field trip!
As an alternative, I sometimes use my White Balance checker, one of the Lastolite spring frame versions to create a little shadow. The simplest system which has often worked for me is to position my body to create an area of light shadow.
But this does tend to create something of a dull day scene unless you carefully boost the highlights during editing, and mask out any hot spots which appear. If you aren't careful it is very easy to create a perfect scene, technically speaking, but miss the real life dramatic impact of the subject; as you mentioned.