I had this problem of lack of height for some years and it was only relieved when I ran some Acoustats, and when I drove some good dynamic cone systems loud.
A few years ago I bought some speakers with SOTA tweeters, voila heighth appeared at normal levels, but since the speakers were tallish (48") I thought it was due to height. My last (present) speakers ar runts at 40" but also have SOTA tweeters and appropriate height. My conclusion is that the quality of the tweeters resolution can make a large contribution.
Also, FWIW, IMHO, if you are getting a lot of soundstage width, on the plane of the speakers, outside of the speakers, you are either playing recordings with a lot of out of phase information encoded, or you have something wrong with your set up. In a 2 channel system playing stereo recordings w/out recorded phase manipulation, all of the information on the plane of the speakers should be contained w/in the space between the speakers. If there is a sense of airiness and a huge 'soundstage' beyond the speakers laterally it is more likely than not the result of room/set up issues. Lots of folks like that sound but it can reduce your ability to get holographic (truely 3 dimensional) soundstaging.
Oh, FWIW re electronics being a consideration, I had no real low volume height with some pretty good stuff and I now get it with some pretty average stuff. Not to say that resolution in the electronics doesn't make a difference, just that it is not the first place I would look for a solution.
