Not sure if you want to raise your crossover to 110 if Audyssey reads at 40. I would probably set it to 80 hz as Audyssey creators suggest. The reason being that the center channel will decipher more clearly those frequencies. There is a lot of sound effects that are sent to the cc as well as some deep vocals for ex. Shwarzenegger in Total Recall that may fall into those frequencies that the cc will handle better than your sub for a more harmonic experience.
Yep, I plan to play around with various settings. Unfortunately, my "home theater" at the moment, is housed in a portion of my 25x23 foot unfinished basement. Hardly the ideal setup. I suspect one reason the center channel got set to a lower 40hz crossover point, is because it is partially housed in a cabinet, while the identical front L/R speakers are resting free in space. Perhaps once I build some walls and hang drywall, things will be better matched between the front speakers. Probably having the L/R speakers sitting in the middle of a 25x23 foot room with no wall behind them, doesn't do much to enhance their bass output, hence the AVR set their crossovers to 110hz.