Ok, I didn't use the NOOBs, but instead just extracted recalbox on my computer, adjusted "partition_size_nominal »: 4000" in "partitions.json" as suggested by Nick, saved and copied all the extracted files to my FAT32 formatted 64GB MicroSd. Installed as fresh install and now I have 4GB root partition. Hopefully that's enough space to scrape the rest of my collection of ROMs. Hopefully after some testing it clears up some KODI isses as well, though I think they are Addon related or a system settingpartition I have wrong...