RMBG - I've had exactly the same experience with my 950. For some reason DD and DTS is wonderfully full and accurate sounding, and 2 channel even in bypass (though an improvement) sounds tinny and unmusical.
I've looked into some tube line stage stuff, but haven't found anything satisfactory. My options are:
1) try to find a audiophile grade A/B switch to integrate a 2 channel pre
2) use the sony TAP9000ES and either use its preamp or easily connect another 2 channel pre to it; or
3) move to the Rotel 1066 which everyone seems to agree has a warmer sound.
While the Rotel would seem to be the simplest solution, I'd want to audition it first to make sure it did the job with 2 channel (which at its pricepoint is not a forgone conclusion).
If I had the $2500 plus to invest, the Anthem AVM 20 does great with 2 channel AND multichannel. But if I did that, I'd never be able to afford a FP projector...
Ah feel yer pain.