Your room is not bad, 300 ms bass has decayed quite well in line with higher frequencies. This waterfall shows a few room modes as well as possible nulls, but your Audyssey has probably worked on them by shifting phase.
When doing manual room mode correction, I suggest turning off any automated dsp and run them again after room modes have been dealt with.
I would try a few filters and then reiterate.
40 Hz, Q 4, -5 dB
65 Hz, Q 4, -5 dB (this is tricky because it phases out and manifests slightly higher. would need much more testing)
110 Hz, Q 4, -5 dB
250 Hz, Q 4, -5 dB
When the room modes are killed, I would use a shelf filter to lower bass response, but this depends on your personal preference.
LShelf 67 Hz, Q 1, -3 dB
With REW you could simulate the filters, but you need to also measure to confirm. When doing this manually, you need to be prepared for multiple iterations and progressively test filters to see how they affect. The effect of a filter is not always linear, because it room modes can die out with less than what they do and phase shift of the filters can affect them as well. The filters I've provided above are just off the hat values from looking at the graphs, but should have good impact.