I think I see what you are going for. One drawback to using the pre-amp outputs is that they are not only affected by the 1050's volume control but also by the "mute" command - so muting the home theater speakers at the 1050 would also mute the pre-amp outputs, leaving the TV with nothing. (This, even more than the reduced level of the pre-amp outputs, may be what you've been running into.) The record outputs are independent of the mute command, so you could mute the 1050 and still get a signal to the TV that way.

The only hiccups here that I can see from just mulling it over in my head are (1) avoiding having the TV's speakers playng all the time and (2) needing analog connections for any sources you plan to listen to this way. I'm not sure how your TV works, so I don't know what alternatives might exist to deal with the first issue. The easiest is probably to turn the TV's volume all the way down to 0 except when listening through it, but that's not the most graceful approach. The second problem is relatively easy to fix, if somewhat messy - grab some cheap interconnects from Radio Shack for any digital audio sources you have and add to the maze of cables already on the back of your equipment rack.

Best of luck with it. I'd be curious to know what you end up doing.