Looking how to space out Nether Fortresses from a DataPack

Hey there :D
I'm using DnT Nether Fortresses Overhaul v3 and want to space the Fortresses out more. As far as I've understood the files and paths this DataPack doesnt have a structure_set folder where I could change the spacing. In data/minecraft/worldgen/structure I have the file Fortress where I was able to change the general size. When reading this guid: https://www.planetminecraft.com/blog/custom-structure-gen-documentation/ it said that the spacing between structures is set in structures_set. 
Now back to my problem, what do I have to do, to accomplish the new spacing?
Thanks for any help and infos :D