Paul, your measurement, far field at the mlp, looks quite good. Really good, actually.
If anything, it looks ever so slightly elevated from about 3k to 6k. Such a broad elevation may impart some brightness or forwardness. The modal stuff down lower is nigh impossible to assess remotely, and nothing really jumps out as a glaring problem.
So you're doing pretty damn good IMO. Sure, you could go all OCD audio nerd to make some marginal improvements, maybe, or kick back and enjoy the fruits of your speaker choice and calibration efforts.