So I must admit I never looked closely at each of my SEF usages before, but now I do. I'm a sad panda now. You guys made me a sad panda, as you pointed out to me that this ability is bugged. Now I started to see how the clones sometimes stand still, sometimes don't use FoF (but then start using other skills). Now it also makes sense how my dmg does not skyrocket for a correctly executed SEF & follow ups.

I hate you guys for making me aware. :/
Thank you for being there and sharing your knowledge!