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should that I be aiming to hit the 75dB line, or should the mains fall down the line with the subs?
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The target for the mains is the same as it is for the sub - 75dB (as shown in first pic below). And you've accomplished that. You're only a few dB either side of the target, so any more adjustment wouldn't reveal anything too much better to your ears. The only minor, minor thing that might be considered weak in the diagram below is the area from 45 Hz to 80 Hz. This area has a lot of information in it, and would give a bit more punch if a bit higher. It certainly isn't a room mode lowering that, as evidenced by the picture at the bottom below (yellow trace). Actually a simple wholesale level change with the sub amp gain control would fill that area in (but may make the 15Hz to 45Hz too hot for you....
At this point though, your ears are the best tool for telling you if you like the sound. If you feel the sub is a bit hot or cool, you only need to adjust the level on the sub amp a bit......
target.jpg 
brucek