In what way would you say the results are poor? That is actually pretty good given your limited coverage. The areas that are not rendered correctly only have a couple, if any views of it. See that green area in the middle, that didn't get enough coverage either.
If your main goal is to get a good 3D model you should use at least 80% overlap. Think of this way: give the system 20 views of everything you want to be rendered properly.
If you are using a Grid mission tip the gimbal up 20-30 degrees so you are getting more detail on the sides of the structures. Also, cover an area that is slightly larger than what you think you need so you get the views from further away on those sides as well.
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