Value of burn/break in?

I'm in the same boat, but it doesn't take much. A little shift here and angle there. Again, I don't have my Audiophile License yet but it really does make a difference. The main things I was able to notice with my inexperienced ear were bass tightness and the 3D aspect of the sound stage.

n80...so you noticed bass tightness and soundstage with minor adjustments in speaker angle? Interesting! Will try but I have read that pretty much everyone puts their speakers toed in at about 45 degrees so there is a triangle listening arrangement

Speaker placement is fundamental to good sound (as is the speakers' dispersion pattern-but we can't change that!). I suggest you try the following: measure room width and place the spkrs at ~45% of that width from the back (i.e. behind them) wall and ~25% of that width from the side wall. Measure from the centre of any unit (say, the woofer). Listen and then fine-tune the sound moving the speakers in very small increments.
Good luck!

have read that pretty much everyone puts their speakers toed in at about 45 degrees so there is a triangle listening arrangement

Toe-in depends on many factors. 45 degrees is common if you’re sitting close in the near-field. Different speaker designs and room acoustics will dictate the angle of toe-in.
My setup is in an equilateral triangle, but due to the dispersion from my speakers they are firing almost straight ahead. This is what the designer John Devore recommends and the soundstage and image are right on the money.
There are different theories on how to set up speakers, but whichever method you use, it’s always time consuming. Taking measurements, listening, adjusting position, then listening again. And each time you adjust the speakers it should be in small increments as stated above. One inch may get you to that perfect soundstage.

It should be mentioned that the rake angle of the speakers will play an important role in setting your desired sonics and image.

If folks would use the speaker set up track on XLO Test CD or similar Test CD instead of guessing by trial and error they would probably find that speakers should usually have no toe in. They would probably also discover that their speakers are too far apart, which partially explains why they toe the speakers in. Trying to find the absolute best speaker locations by ear is like trying to solve n simultaneous equations in n+x unknowns. The best you can do that way is find local maximums.