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Old 4th June 2020
A couple of things in your measurements:

1) You are driving the sub too hard. Your distortion and noise figures in the sub low end are too high. Something is wrong at 50hz which looks like a grounding problem.

2) Is your room too dampened?

The recommended decay for a listening room your size is around .2sec
Right now in the high end your in the sub .15 sec range already. Adding more trapping will dampen it even more, so it has to be treated so it doesn't absorb above 300hz.

3) There are weird vibrations (350hz) and resonances that need to be take care of.

Treatment is needed for the 1st order modes, 1-0-0, 0-1-0, 0-0-1 as the decays are too long.