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Welcome back Marc. It would be good to find out exactly what is causing your dip. Lupo is clearly skilled with reflection hunting, so I suggest that you send him your measurement file if possible. In post 17 I suggested a result orientated approach. That approach would help you reach the best compromise of speaker and listener positions. I am not sure if you want to leave fibreglass on your floor! However if you could find out the cause or causes of the dip, you might take other actions as well. e.g. If you have side wall bounce, you might consider using much thicker traps there, ditto the ceiling, thicker cloud, and so on.
Worth checking the modes issue again.
This sounds very simple in the context of all this measurement and calculation. However, simple can be very powerful. Generate a sine wave and sweep it in the dip region to see if you find a resonance. There may be more than one. When you settle on one, move about and locate the hot spots, typically at a boundary or corner, including the ceiling and ceiling corners.
DD
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