I've only ever found the 7-2 boomy when the position switch isn't set correctly. IMO it's one of B&O's best speakers - a truly phenomenal performer.
The BeoLab 8000 and BeoLab 7-2 aren't really alike in their basic design, regardless of the duality of the 7-2 as a stereo speaker. The 7-2 is a three-way design (woofers, midrange drivers and tweeters) with three seperate amplifiers. Admittedly they are similar in that they're bass-reflex/ported, but this is quite a common design.