Firstly I don't see any of your images. Could be me, but I'm not sure. Secondly I agree where the XT1 produces some amazing images -- I still use mine over my XH1 for certain shoots. I also feel the High ISO on the XT1 is a bit better than the XH1. My opinion anyway.
As far as your issue goes I wonder if it has to do with the processing engine on the XT3 vs the XT1. Maybe you need to tweak the recipe's to get what you want. Have you tried that?
Thanks
J