I did not read through all the posts in this thread, so if this was suggested by someone, my apologies...
Once more, I have to steer an Onkyo AVR owner to their unit's "IntelliVolume" feature; this "lack of overall volume" issue with this company's amplifier products gets brought up countless times on HT enthusiast/hobbyist sites -- just search this on AVS. If you're looking for the receiver's amp to
seem like it's putting out more power and for it to appear louder at a lower volume number on the display readout (which is something I was/am after too, so I understand the frustration), go into the unit's "Source Setup" section of the Setup menu, and bring the "IntelliVolume" value of the connected source device (i.e. Blu-ray player, cable box, CD player) up well into the "+dB" range. For example, my Blu-ray player's input IntelliVolume on my Onkyo 605 is set to "+10dB" and I could probably go higher; but...alas...there are some things you must know about using this menu option:
First of all, if the receiver's volume goes from, say, 0 (min) to 99 and then MAX, like my 605 does, this assumes no speaker calibration values OR IntelliVolume trim are engaged past "0dB" -- once you bring any of these paramters beyond 0dB and into the "+dB" range, the receiver automatically compensates for that, and lowers the available maximum volume accordingly. While I don't like this

mad:

) I can live with the tradeoff, which is on a well-mixed and engineered Blu-ray or DVD soundtrack, the volume is punchy and louder at a lower number on the display screen. Now, many will say that bringing up these values to "+10dB" or whatever does nothing because in the end, it's the same -- and that's true. But as I said, if you want the amp to seem like it's louder at a lower value, IntelliVolume can work. It's not really what it was meant for; the system was designed by Onkyo so that end users and installers could "balance out" input trim levels between components so one isn't louder than another when switching them...for example, if the Tuner is lower than the DVD input component, you can raise the Tuner's IntelliVolume to balance it a bit better, OR lower the DVD IntelliVolume trim. However, many Onkyo -- and subsequently Integra -- owners use IntelliVolume such as I am, and how I described, whereby the control acts like a power amp's "gain" making the receiver's amp louder or lower at a given volume point.
There is a whole lot more I can say about this, but that's pretty much it in a nutshell -- let us know if you tried IntelliVolume and what happened, or feel free to fire me any more questions.