The moderation is the struggle, lol. I've never had the Allium ursinum, but I don't think I've ever had a bad member of the onion family. I have foraged and eaten Ramps (Allium tricoccum) in the eastern US. Maybe they are something like your (A. ursinum). The leaves are good stuffed in a trout! :D There are so many good wild things to eat! Happy foraging to you -- and I hope your dissertation work is going well!