I heard some months ago “If you think that you need to Delay something to solve a simple Problem, just think again”.
And I’m pretty sure, that this is a very common thing, that shouldn’t solved with Delay at all.
I “solved” the Problem with register my Actors (10 Actors) to the GameMode and do Stuff within Level Blueprint with the Array of Actors I got stored in GameMode.
This is my “workaround”.
If anyone knows a better (common and/or performant) way to solve this common issue, feel free to post it here.