Sound is better when I stand up?

The Ref angled baffle as others mentioned points the drivers upward.  This is by design for phase and response.    When standing your ears are more on axis and you hear more midrange and treble and less floor reflected bass.  

Not every speaker sounds its best with the .83 ratio.  Before doing anything  else I suggest experimenting with speaker positioning.  Tape mark your current positions then move them closer to you and further from the wall, as much as reasonably possible.  Keep them at the same width apart and experiment with toe angle to adjust for imaging and smoothest response.  If the sound is too thin you can move them closer together and re adjust toe angle.  

I actually prefer the sound of a wider stance for the speakers as learned when I had audio note speakers, makes for a bigger sound stage and more open spacious sound.  my speakers are 26 inches more apart than the .83 ratio would like but the sound is better. 

Again, pull them away from the wall, keep them wide and adjust toe angle for best response and imaging, ranging from aiming to a point 3 feet in front of you and progressively outward until it sounds best. 

I think you will be pleased without spending a penny.  

Great advice so far. Chair not higher than shoulders. Tweeter at ear level. I think your distance ratio is prob ok. I’ve read tweeter to tweeter is 1 and tweeter to ear should be 1.2. This ratio works for me. Good luck!

Ron 

@Samao

i had Ref 3A GV’s for years. Tosh Goka always advocated fine tuning of the front baffle with the adjustable feet. Can’t tell if you have stands provide that ability. 

@Samao

i had Ref 3A GV’s for years. Tosh Goka always advocated fine tuning of the front baffle with the adjustable feet. Can’t tell if you have stands that provide that ability. 

How close to the back wall do you have your speakers positioned.  I moved mine forward and it was a game changer.