Ok figured it out! Here is step by step for unfortunate souls in the future. This will also allow adjusting any margin not just the top.
1. My PW1 Kindle was on 5.6.1.1, so I downgraded it via "
update_kindle_5.3.3.bin" from this post:
https://www.mobileread.com/forums/sh...d.php?t=264432
Make sure to read all the instructions.
2. Get Jailbreak from
https://www.mobileread.com/forums/sh...d.php?t=225030
For PW1 this is
K5 JailBreak (5.0.x - 5.4.4.2)
3. Reboot
4. Dont think this is necessary but I did it anyways. Download and install MR Package Installer
from the link above.
5. Install JBPatch from
https://www.mobileread.com/forums/sh...d.php?t=175512
For me it was
jbpatch_4.0.0_fw531.zip .
Now restart Kindle. Look for a book on there called JBPatch. Open it, go to
Modify Reader Margins. For me I changed Top Margin from default 40 to 74, and Top Margin offset from default 12 to 26.
That solved it for me. Now it looks like this. The time/battery and top menu are still messed up, but at least books can be read normally now:
https://imgur.com/a/xkMjzIb