Hey there, a lot of people have their personal approach to how much they collect and how much they leave behind for everyone else, which I think is great. But I really love that you are engaging in a directly reciprocal relationship with the plants that are giving you such an incredible gift. By spreading seeds (or roots) you are engaging as an active participant in the landscape that you live on... as indigenous humans had been doing way before colonization. This is how the original "food forests" existed.
The other piece that for me goes beyond percentages etc is really intently observing shifts in my landscape. Are the plants that I am foraging thriving or are they struggling? If they are struggling, can I tend to them in a way that supports them? Eg trimming back "invasive" plants, introducing fire to the landscape, bringing forth policy at the town level to protect threatened areas, or helping usher plants to more appropriate habitats as climate shifts. All of these things are within the realm of possibility when these plants are part of our livelihood. So I guess my point is that just by foraging with consciousness I think you are helping these plants thrive.