You shouldn’t need to do the subtract from 17 thing on newer versions of LightBurn. Just enter 0 if you want the height of the honeycomb. 3 if you had 3mm thick stuff sitting on top of the honeycomb, etc.
Have you seen this info?
https://forum.lightburnsoftware.com/t/how-to-use-gweike-cloud-with-lightburn-tips-tricks-faq/