Have you tried using "fatigue" mats on the floor where you stand at your LA? I work in a school cafeteria and it makes a difference if the shoes have good support (try a "walking" tennis shoe - New Balance works for me) The mats we have that are the best are about 1" thick and kind of squishy, I have seen some advertised on TV but if you Google "fatigue mats" I'm sure lots of options would come up.
Kathyd