I am sure that will be fine. Some people have mentioned using an 80 hz crossover for movies and a 60 hz crossover for music, or even 80hz for both.
I lowered it a bit and found it to sound good, plus It makes me feel like I am taking advantage of the woofers in the towers that I paid for a little more
Just experiment and see what sounds best to you.
You can increase the bass of the SW just by adjusting the channel level. If you want to increase the low frequency on the m60's you can copy your eq curve from audessey and manually adjust up the lower frequency's a bit.
I recommend making adjustments in small increments.
However, be careful making too many adjustments after you run audessey, it can open up a whole can of worms! Also, you might end up like Mojo, tweaking your system for at least a good 6 months!
After all of my tinkering I found that no EQ curve, no audessey, and a simple manual channel calibration sounded best. I still plan on relocating my subwoofer and adjusting things more in the near future.