I’ll bet when you first moved here and asked about morels not many people even knew what you were talking about. That just means more for we that know. Elms are rare around here but for sure check them if you see them. Last year I was finding them around dead Ash more then ever before. I look mainly for Poplars, large and lots of them. As far as dead Poplars, unless the tree was struck by lightning or suffered great wind damage I don’t think they produce more then live trees. Even with the damage they don’t produce as well as a dead Elm might. Mix in with the Poplars may be other trees the only one that seems to stop morels is the Oak. I’ve not had great success around Sycamore but know others that have. I hope this helps and best of luck...... What kind of success have you had your first 2 years???