PSB Speakers with the tweeter under the midrange/woofer are designed in combination with their crossovers to beam the sound slightly upwards, so there is not a big difference in sound when you are standing or sitting. That is just one of Paul Barton's design quirks. So, maybe try listening to them upside down to beam the sound a little lower.
Speaker stand height
I have a pair of PSB Stratus Minis on their factory 25" stands, but these seem too tall for my room/listening position. My listening chair is somewhat low and laid back and this i do not want to change. So I was thinking of buying lower stands so that the speakers are closer to my ear but am worried about messing up the overal tonal balance of my PSB's. Should i Be worried about the sound changing too much with lower stands, or will it simply give me more bass and a more direct sound?
btw iv'e experimented with putting these speakers on 10" concrete blocks, with a title to compensate for the height, and this seemed to make the sound much fuller. This was many years ago though and my memory could be fooling me.