Your use of "only" 2 channels driven indicates that you may not fully grasp the significance of the amplifier power ratings. 2 channels driven(at full rated power for at least 5 continuous minutes)is the basic requirement set by law(Federal Trade Commission regulations)for the ratings(a 1 channel rating doesn't comply). The FTC explicitly rejected a suggestion to make the requirement all channels driven, finding simultaneous full power in all channels to be unrealistic in home use.
Blu-rays and gaming certainly do have things going on in all channels at times, but this isn't at full power in all and the 2-channel FTC rating is the more realistic one overall.
The quoted portions of the 2010 review were actually done by Sound&Vision's Dan Kumin(not Home Theater Magazine)some months before the merger of the two under the Sound&Vision title. The numbers shown there on the lab test with 2-channels driven were 161 watts into 8 ohms and 255 into 4 ohms.
Listening distance is a key factor in power calculations and from your picture it appears that you're operating in fairly close quarters. There's nothing to indicate that unless you'd like to employ listening levels that would cause permanent hearing damage that the rather substantial capability of the 2010 isn't ample for your needs. You've stated that it's been "excellent" and there's no good reason to suspect that this would mysteriously change. Purchase of an additional amplifier with unneeded excess capacity isn't economically sensible.
