Just fyi, I know you like your 7705, but I have been recommending the Denon AVRs, yes AVRs, over the 7705 (when asked) because that's my experience too, that my Marantz AVP hiss my speakers when the room was quiet; and the volume setting was high, the AVRs were silent. That was predictable, based on measured results on ASR.
Now that we know the AV10 will be silent (again based on measurements), hopefully (almost certainly...) whatever they come up with, to replace the lower model 7706, will be silent too. If I were you, I would trade in one of your 7705s immediately.