Hard one to answer.
A lot of the way a speaker sounds depends on it's relative locations to "room boundaries". A room boundary is a wall, floor or ceiling.
Bass is increased by placing a speaker near a room boundary.
A speaker on a stand near the middle of the room walls is not near any room boundary, so it's bass response would be weak.
If you put it near the rear wall (one boundary) , bass will be improved somewhat.
If you place it in a corner, near two walls (two boundaries), it will be improved somewhat.
If you place it on the floor in the corner (three boundaries) , it's bass will be maximized.
So much for bass. Let's look at the other end of the spectrum.
Mid-range and treble dispersion from a speaker is maximized when it's on a stand in the middle of the room.
As you add room boundaries, dispersion is reflected back and ultimately harms that end of the spectrum.
So, in your case, I would think that the bass is augmented somewhat by having it on a table but hindered somewhat by not being near any other boundaries, while at the same time, that table that helps your bass is hindering the rest of the range.
IOW, putting them on stands will help the mids and highs but will hurt your curent bass situation.
And, as far as "thin" goes, a lot has to do with your expectations. It is, after all, only a 6.5" driver. More power may help somewhat but don't expect miracles.