Capture One has the full support of Fujifilm (and Sony). All the Fuji bodies and lenses have native support/corrections and it handles Fuji raws better than any editor I've ever used. You can also try out different film simulations within Capture One which is sometimes a lifesaver.
I'd seriously consider switching away from Rawtherapee. If you own an X-E3 you shouldn't use janky open source raw editors. I'm not saying pay for it, if you're using Rawtherapee you probably won't, but try and get your hands on Capture One. It's worth it.