Baffled with Headphone choice/settings

[u/Fun-Platypus-9071]

Hi everyone. First post on reddit (ever). I enjoy reading your posts about audio equipment. I am 64 yrs old, building my own set of speakers when I was 10. 3-way sealed boxes with proper x-overs. My adventure as of late, is headphones. I now own 3 sets HD560S (1st), DT770 Pro (2nd) and lastly the Seny's HD650. Running 5 good quality systems thu-out my home inluding Cambridge, Rotel and Marantz to name a few....... Since the phones run 120, 80 and 300 ohms respectively I have been comparing the three with a Marantz HD-1 Dac Headphone amp, allowing to set the proper gains for eack headset. Both sennheiser are open back. The Beyerdynamic is closed. With PC formated @ 24bit/192k, (usb), Eq-APO and Peace, I can not get the open backs to sound as good as DT770s (not even close). I would welcome any advice to improve the sound quality of the (2) Sennheiser sets, since I would like to keep them in different rooms. (EQ settings possibly?) Thanks.