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You have a variety of options regarding the 2 prominent LF resonances.
You can simply try employing lots of shotgun corner traps, or you can spend a tiny bit more time to locate the spatial distribution of the ~82 and ~130 resonances and employ tuned (Helmholtz) traps (be they tube, resonant panel, perforated, etc) to more efficiently treat them without killing the remaining semi-diffuse soundfield above the modal window.
The ~82Hz dip bears a bit more investigation, as it can indeed be caused by a room induced reflection or, as it is a common sub/main crossover point, a result of the signal alignment between these two sources, something that a delay unit could help resolve relative to your listening position. Impulse measurements would help you there...as would windowed and convolved ETCs, as you could quickly determine the delta in the arrival time of the two signals and adjust a delay unit accordingly.
As far as above the modal range of 200-300Hz, I would shift your focus to the use of an envelope time curve (ETC) in order to look at the arrival times and intensities of each specular refection(s). Resolving the anomalies from that perspective will resolve the superposition induced frequency anomalies.
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