Hello,
First of all thanks for your awesome tool!

But i dont get the right resolution for my smartphone (SM-A520F//1.080x1.920px//5,2").
if i try Kindle Series or kobo as Target device the i will get big white frames: (Stretch/Upscale checked)
if i try with costum resolution i get only double pages: (with Spead Splitter unchecked)

maybe Spead Splitter option buggy?
this is shit because you need to zoom in every single page! the original has only 1 image each site, this is much more comfortable. You only need to swipe to next site without zoom in. With kindle mode i have 1 image each site but the borders are so big that i need to zoom in too.
i want to look like the original:
my input is cbz file with image resolution 841x1280 and i need a epub file for google books.
If i view a image on my phone it has der perfekt resolution:
KCC 5.4.5 windows 10
since 6 days it try to find the right setting...
I hope someone here can help me.