I had this one worked out before I went into the hospital but it is back.
About half way up my forearms on the bottom, I get a crease from the edge of my desk where my arm lays.
If I raise the chair up, my legs will hurt. With the chair down, I get the sore arms.
Maybe if I raise the chair and use a footstool but, then my legs won't fit under the desk.
Maybe a cloth taped to the edge of the desk?