Thanks guys. BrianM -- great suggestions. I used many of your previous posts to get me this far, and appreciate your insights.
I am not using Super Duty, nor a wool pad.
I, too, think I am not getting the 600 scratches out. Like your suggestion on sanding same way to find root problem. But it sounds like I also need to go to wool pad (versus orange foam I am using now). Do you think I need to go to Super Duty as well? Or just take it in a step-wise fashion...better sanding, wool pad, and then if it's not what I want, try Super Duty? Nervous to hit it with a circular given my lack of skill.