Amazfit Watch faces

Hello! I made a theme and all my finals total to 80kb. However, as soon as I drag the json file to WatchFace.exe it makes a bin file that is 372kb and the mi band won't sync with that. Is there anyway I can covert the json to bin without it resulting in too high of a file size? Thank you.

Use palette mode for now) and compress images + remove transparency if its not needed

I may be wrong but afaik, the important thing is not (only) the actual size of your pngs (and yes colors and transparency as said above) but the number of references in your json.
1png of 1kb used once is bin-lighter that 1png of 0.5kb used 3 times for example.

Again i may be wrong...