The Q701 acts funny in imaging with some rigs and more so because of amps. For example, they were perfect with the Vali and Yulong D100 pairing since the Vali were a little challenged in the soundstage dept, which the Q701 seem to match well with. Now the same DAC but with the Tubemagic A1 amp and just like you describe, it sounded separated from right and left which makes it weird when sound is suppose to be front and center.
I use the Q701 for gaming with my Astro MixAmp Pro and the placement of movements in-game is EXTREMELY precise. I know this is a little different than listening to music, but it's better than any other headphone I've ever used while gaming.