Need help with room and speaker setup, big dip from 250-80hz

I have a very small and odd room.  The room itself is 9' wide by 10' long with 9' ceilings.  The wall directly behind my head is only 3' tall, above that it opens up to my family room and kitchen.  I have the speakers firing down the 10' length.  The speakers (Sonus Faber Guaneri Evolution monitors) are toed in directly at my head, 3' from the front wall, and 1.5" from the sidewalls.  I have bass traps in the corners, absorption at the 1st reflection points and ceiling, and a mix of absorption and diffusion on the front wall.  My listening chair is right up against the short back wall.

I just did a quick measurement of my room using a cheap RS SPL meter and some test tones.  It seems I am -6db at 630hz and 250-80hz.  Any advice what I can do to help alleviate these dips?  As you can tell by my room dimensions I do not have a lot of flexibility.  Thank you.