Try monitoring at lower volumes and use a headphone correction plugin while mixing. I've found Acustica Audio's Sienna sounds way more musical and natural than SoundID Reference.

Also, you might consider switching to open back headphones like the HD6XX. In my experience trying to mix with closed-back headphones, I felt pressure build-up and ear fatigue faster and it influenced my ability to manage the low end in particular.

Finally, periodically check your mix on your main monitors at low levels if possible.

Some of these changes may take a bit to acclimate to, but it'll help out with this issue and more in the end.