I think the first thing you can do, if you have not already, is purchase the audyssey app and change the target curve to your choosing then rerun the audyssey room correction. Like Amir's Harman target curve for example. That should demonstrably improve your sound.
I disagree with the others that more power won't make a difference. More power will give you more woofer travel for your larger drivers in your speakers giving you more sound pressure from your woofers. 60 watts is not enough to get the most from your speaker's woofers.
Here is a good example of how the music and movie sound track really determine the amount of power you need more than the speakers do.
Same speakers, same amplifier. The amount of power used for one song is 10-20watts, the amount of power used for another song is up to 400watts. Because there was much more demand for bass notes. Which includes notes above your subwoofer crossover.