So, your pages 1 and 2 are now pre-merged properly, and the levelling also improved. However, there's no need to remove the granular pattern of the art
. That's not dust, it's the artist's choice. I don't know which filter you used, but you can see it made the background areas blurry. Also, the adjustment layers should be present in the merged page, too, not just in the separate halves. The cropping was much better.
Nothing seems to have been done to page 3, this time, other than removing the text from the bubbles. Try to look up how to remove JPEG artifacts from manga.
Page 4 is better, but you can still see lots of dust. Try using a hyperlevelled layer to highlight all the dust in the white areas, and you can use Dodge or another tool to get rid of it. Also, you didn't have to use Burn separately from levelling, all you did was remove details on the art (like the character's hair, eyelashes and mouth in the last panel).
On page 5, all areas that should be white are not uniformly white. Why did you burn the soldiers armour in the shadow again? That was art, not dust, as you can see it is more intense and uniform than the dust. However, you did preserve detail reasonably well and the cropping is good, too.
Page 6 is actually worse than the previous version. All you had to do was crop the previous version correctly. Now it's blurry and the areas that should be white are a mix of grey and white.
Page 7 is also worse. You only had to use Dodge or even the white brush to find any remaining dust and get rid of it in the previous version. Now the page is all blurry.
I think your main problem is that you're trying to find an easy solution to get rid of dust. I don't think there is any. When it's just the paper texture, you can probably get rid of it if you know how to use Surface Blur, but the best solution, especially in the case of high-resolution raws, is to get rid of it manually. Add a levels layer to highlight the Dust, then hunt it down to the last speck. You can use the Magic Want, a bubble cleaning Action, like this one: https://www.dropbox.com/s/kch9rcn9in89z ... e.atn?dl=0
(instructions at https://www.dropbox.com/s/pwdzunptef97y ... e.png?dl=0
), even the white brush if you're careful, but don't try to get rid of it by filtering, especially in the case of high-res raws.
I'm being deliberately vague because you have to experiment with these tools. See what preserves the most detail and the original sharpness of the image, and go with that. If we tell you what to do exactly, you won't know how to make your own decisions later when cleaning.