"I can only keep the speakers 20-23 inches from the front wall."
$50K speakers and you can't put them in an optimized position.
You probably will get them to sound good in any location, but a speaker especially like that deserves to at least be influenced by the "rule of 1/3rds" -7ft or Cardas type distances from the front wall.
http://www.cardas.com/room_setup_calculators.php
From TAS review
"They worked beautifully when placed well away from the sidewalls and near the rear walls in my listening room. They have a surprisingly flat response down to around 34–37Hz, going much deeper with a slow roll-off, with audible and measured power to below 30Hz."