Doing treed areas require some special care. 80 meters seems to be the sweet spot and definitely use the 80% overlap setting. We highly recommend doing smaller free data tests to figure out what altitude and overlap setting will work best for the kinds of trees and terrain you are dealing with.
We have a lot of people doing large forestry sections and they turn out well once you get it dialed in for the type of trees you are dealing with.
All jobs done with our app that are less than 52 images will be free to process. Do a few tests at various altitudes and overlap settings to make sure it comes out as expected before running any large data sets.