Hi,
i just check the ios file size, which is far bigger than the android version ( 80mb vs 190mb ). Turns out i have 50mb only for the launch images 
Currently i have them included in the project file with <launchImage .../>. Is this up to date? And is it possible to use jpegs?
You should use storyboards for iOS starting this June, which is 1 picture for everything screen, if I understood it correctly.
Lime 7.7.0 should support it, Iām not sure how. 
UPDATE: <launchstoryboard path="image.png" /> in project.xml, check https://lime.software/docs/project-files/xml-format/ for more info.