Okay, so you're using decent products. I went back and re-read this again and I'll just make a few suggestions to "try." First, I think that your clear should be left to dry more than 10 minutes. I mean, I know lacquers dry fast but you should be letting those areas "off gas" a little longer especially if you've applied a few coats at the same spraying. Try more like 15 to 30 minutes. Why? Well, this should give you a "harder" and more stable coating to cut down. Trying to use 1000 to 2000 grit paper to blend is just not enough to "level" the coating. Your paper is just gliding over the tops of any dry spray and orange peel. I'd drop at least down to 400 grit/wet, move up to 600 wet, then depending on what sheen your matching, go brown paper bag/wax, or for high sheens move on up to the 1000 to 2000 range combined with some compound/polish, etc. If you've been staying away from those lower grit sandpapers because you are afraid of "breakthrough" get some old tops or cabinet doors and just practice. I've leveled coatings down to 240 grit before to get over some poor refinishing and patch work.
Like you, I too am constantly on the road doing this type of work in homes, offices, etc. My big advantage though is that I still do production style finishing 1 day a week in my shop. That has always seemed to help me to figure out how much I can push these coatings when it comes to sanding, polishing, etc. Hope you can get it figured out, I do know what it's like when you just can't get topcoats to blend in.
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