Increasing height of stand-mount -- what to expect

Usually speaker manuf design speakers such that the woofer distance from the floor is a specific amount. This relates to the woofer coupling to the floor for the intended bass response. Moving the speaker up chnages this distance & chnages the bass response. You might want to contact your speaker manuf to see if they have such a desired woofer-to-floor distance or not.
Yeah, sonics are not that good when your ear is above the tweeter since for most speakers the vertical dispersion is terrible (you can see this in almost every speaker tested by Stereophile). So, your idea to get your ears below the tweeter is a good one.
Usually the best sound is when your ear is 1" below the midrange driver in a 3-way & in between the drivers in a 2-way. So, it might actually be better for you to lower your seat.

Csmgolf, That is correct. Most people know the distance from the wall behind the speakers changes the tonal balance, however, there is rarely any thought given to the distance between the floor and the speaker which is a critical room boundary as well.

I might suggest first tilting them back to see it presents a better sound when roughly at the same height.

Then, if the mid-treble balance is better, any differences in height related to floor bounce can be heard by shimming the existing stands with a block or whatever.

Hornguys, I am curious why the midtreble is the only area of concern when tilting or raising the height of a speaker. Can you please explain?