Because your waterfall's dynamic range is less then 30dB, the peaks and nulls look worse than they are. I suggest to post the zipped REW file. In addition you should limit the frequency range of the waterfall to something like 20 to 300 Hz.
Check Jens' post about posting graphs/measurements: Before posting your measurement results
As it is now, your waterfall does not show the full picture. Hold off of that EQ for now!