Listening Height Adjustment -- Is This Why Two People Don't Hear the Same?

I have a much smaller system.  But, I adjust height, separation, and angel *very* precisely. I find setting the speakers even a quarter inch higher, or lower changes to tonal balance. Stereo is an illusion and requires exactness if a very realistic sound is desired.  Here is a picture of what I use to solve my speaker height problem. I used my old drum rack and modified it.
https://www.computeraudiophile.com/uploads/monthly_2016_05/58cd9944ba975_Picture44.jpg.dbc04cc3ca7f7...And here is what it looks like when the system is set up around it..https://www.computeraudiophile.com/uploads/monthly_2017_08/5986cc890e849_Picturewood3.jpg.dbeff9232c...
I have no idea what to suggest for a system of your size.... There are height adjustable office chairs you might want to look for.

@genez nice super near field setup, very neat and precise

I solved my problems by screwing some 4” risers into the legs of my listening chair, leaves my feet swinging like a child but sounds so much better!

Maybe make something into a semi footstool....  I think you'll feel better?

My speaker maker tells me Where the tweeter should be and I should be sitting at.  But he wants me 9.5 or ,10 feet from speakers.  He even gives me a tool 10 degrees toe in.  I looked  at your set up awhile back
 It's some very nice equipment. I would like to
Listen to Quads  right against the wall There  I listened to a pair set up like that ,,,,,amazing. 

Hi Folkfreak,

It saddens me a bit to see how much money and effort you have plunged into your system only to find out afterwards that one of the most important things for great sound quality (speaker placement) wasn't optimal in the first place.

As Tomic601 mentioned, I'm very surprised nobody mentioned Jim Smith's 'Get Better Sound'. It's by far the best $35.- you can spend on your system. I took one look at your system page and the first two things I noticed before anything else were that your speakers are too far apart and you're sitting too close to the wall behind you.

Your speakers too far apart means you're missing out on warmth and the soundstage won't be anywhere near as good as it can be.

Your head being too close to the wall behind you means you'll hear reflections from behind you mixed with the sound coming from your speakers resulting in who knows what but definitely not good things.

Folkfreak, you obviously spend a lot of effort to optimising your system but you're on the wrong path. I know this might sound arrogant but that's not how I mean this. I'm telling you this because I was there once. I had my speakers setup in the same and wrong position for 25 years! It was only once I read 'Get Better Sound' that I learned how to get the best out of my system. The difference wasn't subtle. I've since replaced my system for one costing ten times as much but the increased sound quality hasn't gone up ten fold. Twice as good maybe. But the sound quality increase I got from setting my system up right was at least 5 fold. Yes, it was THAT much better.

I sure hope you will find a way to get the best out of your system. After all, you've put the effort in so you should be rewarded.

Good luck,

Pim