After testing with both receivers, I'm not sure yet what to do with the loser. I may keep it or decide to sell it. If I still like it, I'll probably keep it, because I'll be working on a dedicated, but smallish theater room downstairs.

Turning your speakers upside down probably put the tweeters closer to ear level while sitting. I have too many speakers to have all the tweeters pointing at my ears. I like the sound better the way I have it with the upper speakers pointing down a little, but towards the rear sitting position.