2ce sig ii tilt and listening height

hello, my 2nd post. i have the 2ce sig ii's and i have them titled back to accomodate my listening height. i sit in an office desk chair and when i lean back in that chair, it seems like the image lowers a bit and warms up, dire straits' mark knopfler's voice seems to blend back into the music and it sounds somewhat more mellow.

now, sitting more upright in my chair (ears a couple inches higher so maybe too high for the alignment?) mark's voice and the music tends to be a little more forward and perhaps more detailed.

question is, which is more accurate considering these speakers and the reported small window of optimum listening position?

thanks