If the panel has been resprayed and you're getting the PTG readings you are, it sounds like you've got a decent amount of paint on the panel. If it is in fact a respray then it sounds like it was a bare metal spray as those numbers aren't too far off what we'd expect to see from an OEM finish. What's perhaps a bit worrying here is that there could have been some isolated damage that required a full fix in a small spot where the color was blended, and then the entire panel was scuffed and fresh clear shot over it (you can't really blend clear, so this is a fairly standard practice).
That said, 2000 grit on a DA sander, with an interface pad, isn't going to be terribly aggressive and, depending on the paint hardness, those 2000 grit marks should buff out pretty easily. I'm always a fan of refining the sanding marks as much as possible to make the buff out less invasive (ie, less chance of overheating the paint due to aggressive machine compounding). Orange peel reduction may be pushing it with that paint thickness, but if the texture is more of a dry spray or similar fine texture issue, then the process you describe might just be the ticket.
The following was taken from an article dating back to our
NXT Institute training session in 2014 Note that we started with even less paint than you have (roughly 90 microns) and we only used 3000 grit on a DA before polishing. This was also a respray, and a bad one at that. It's amazing the changes you can make to the appearance with very minimal paint removal.