>>414236718
listen to >>414237031
also if you use bakery, use xatlas under atlas and unwrapper in the experimental mode. Min and Max atlas size to 4096 It will merge lots of smaller lightmaps to one bigger one.

[spoiler]and use blender, you are gimping yourself, spend a few hours learning it and you will save hundreds of hours at least + keep your sanity[/spoiler]