One of the primary reasons for having some “legs” of a run, whether with copper or other tubing, is to give a chance for the air to cool a bit before it gets to the refrigerator dryer. If the air is too warm, the refrigerator dryer will not be effective.
On another aspect of drying, I found one of the best defenses against the moisture is to be sure to drain the compressor tank at least once or twice per day. That can be done on the “cheap” automatically with a timer and an electronic valve. The valve only needs to be open for a second or two. And the tank is designed to have the moisture drop out of the air.