First: turn the violume down...that should be an easy one
Second: Commercials are almost ALWAYS louder than programming - it's normal, it sucks, live with it (I mute commercials)
Third: That receiver is a respectably powerful one. I would turn down my rear channels through the receiver menu, or at least once you replace your blown ones.
Lastly: You should tinker with the receivers EQ. If tuned properly, you do should not have to crank it to get adequate listening levels. Try emphasizing the frequencies between 700-6000 as those will be most of your vocals.
I have a Onkyo TX-SR805 receiver, PSB towers, JM LABS Sib&CUB (not using the cub sub) 12" Klipsch sub, Samsung 120 hz lcd, and PS3, I have all speakers besides the towers set to "small" the voumes for all small SIB speakers are set to between 6-8 depending upon room placement everything is set up using HDMI cables I am using direct TV as my provider. My tv volume is odd, When certain tv commercials play they seem to be 10db louder than the show or movie i was watching, movies through the blu-ray are awesome and music sounds good but I have blown both rears and sometimes on normal tv the highs sound as if all the speakers are blown. I do like occasional loud music volume. Have I purchased the wrong equipment? I also noticed that my electrician used very very small guage speaker wire when he wired the home for surround, could this cause a problem?