Dale, is it? I read your description of draining and refilling. To shorten the time it took you, I can offer several suggestions. 1) use a parts cleaner, like brake clean, to flush out the old oil. 2) The "ride adjustment" devise is actually the valve assembly. First fill through there while the shock is mounted sideways in a vise and while working the arm. Keep the oil level above the uppermost hole, about at the bottom of the threads. Overfill there, and insert the valve assembly letting the excess oil dribble on the floor. Then turn the shock upright and continue through the lid. Don't overfill, though, just to the bottom of the lid is enough.
Rebuilders, I hope, do much more than what you've shown, but what you're doing is good preventive maintenance. But if there's any play in the arm bearing area, or the seal is hopelessly leaking, or you get either no resistance or a notchy feel when working the arm, hie thee to a rebuilder.
Peter C