Thank you for your fast reply
It really is a shame, that Amazon is so slow in updating their tools to fully support the capabilities of the Scribe. For now, my route to get a somewhat sharp result is KCC -> CBZ for cropping and landscape rotation and Calibre -> PDF.
There are minimal borders and page turn isn't as fast but resolution looks fine.
Is there any merrit using the Kojirou Tools to create AZW3 files to get native res support?