For reference, 'mild' compared to what? What wood did you use for this cook vs past cooks (or) what cooker/wood combo for past cooks?
I find that I get a milder smoke using my LSG vertical offset than when I use my BGE. In the stick burner, obviously I am using flaming wood to cook with. The Egg is using charcoal with wood chucks that are only smoldering. The LSG has tremendous airflow which I think adds to the lighter smoke flavor. I use post oak in it. I prefer the slightly milder smoke flavor.
Do not know if my theory is right at all but there is a difference in the flavor profile.