That’s interesting. Would you mind if we play some games together and determine these concentration problems you are describing?
Yes we can play, any blitz, 2min bullet and 10min rapid I'd play.
BTW I'm also from Germany so we could write in german if you like (I mean in personal messages or the chat in chess matches)
But you are only 1750. A real 2000 is all 2000 bullets, blitz, and rapid.