Sens are among the very best phones out there. They are what I use for editing tight edits. Having said that, headphone listening is not for everyone. In my experience people who can get a satisfying listening experience from headphones are in the minority. I personally can not enjoy a satisfactory experience from headphones.
In my days when I was making live orchestral and choral recordings I could never get the hang of getting the recording to my satisfaction via headphone monitoring. I know it is commonly done, but I defy anyone to get a really great recording monitoring from headphones. The reasons for this a complex and involve multiple disciplines. So in churches, for instance, I would set up my equipment in the sacristy and monitor via speakers. In the local concert hall, I set up in the green room. The orchestra members would crowd in afterwards to hear parts of the recording.
For most, if not all, to get a satisfactory audio experience requires speakers. From my perspective the bigger and more powerful the better. Classical music that I listen to has a huge dynamic range, and few systems are really up to giving a full concert level performance.
My feeling is that you probably will not be happy until you make the switch to speakers.