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Based on the sub curve and the combined curve, I would set the crossover point as low as possible - even 40 Hz if that is available, presuming that the main speakers are capable of 40 Hz. A full range measurement of the L&R speakers with no crossover would also be useful.
The null which appears to be centered at about 72 Hz in the combined curve, is surely a room cancellation and you cannot eq that away. If you boost 72 Hz, the cancellation will just be that much stronger and, although the amp and speakers will be working harder and producing more distortion, there will be no net benefit in terms of flatter frequency response. You can move either your sub or the mains to try to achieve flatter response, or you can install bass traps to absorb some of the bass energy at the point of cancellation.
Be careful if you purchase bass traps, as many products out there that are promoted as bass traps are effective at mid range or mid bass frequencies at best.
 
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