(pasting here what I added in my previous message, as you already replied)
...played around, apparently by enabling "text reflow" disables "native pdf output", I realized it only later. By keeping text reflow disabled I could convert in native mode (albeit slow since only on one core) and the final size not only is very similar to the original file (200mb vs 250mb of your splitter command line batch some pages ago) but I retain color and text quality is better.
Have yet to test on the kindle tho, I just started assembling my 3d printer which arrived just now :P
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