I think it might be a result of the acoustics of your room.
May i suggest to do some research in room correction software like Sonar works, Arc2 or Dirac.
This software can improve the sound a lot.
I have experience with Arc 2 and later Dirac and in my opinion room correction software is mandatory if you want to have the best sound from your Hauptwerk setup.
viewtopic.php?f=17&t=13968&hilit=Dirac
viewtopic.php?f=17&t=16933
viewtopic.php?f=17&t=7938
Also Johannus discovered roomcorrection to improve sound.
https://www.johannus.com/en/news/johann ... t-software
Regards Jan Loosman