@Mino101Could you maybe look into why the edited hardcoded values for margins (that are inside " "/opt/amazon/ebook/lib/ReaderSDK-impl-*.jar" files) aren't being used (even after a OS reboot) by the reader / renderer software since firmware 5.10.x? To figure what and where overrides them.
Some links as a starting point:
https://www.mobileread.com/forums/sh...postcount=1795
https://www.mobileread.com/forums/sh....php?p=2527653