Some of the fights are harder than they should be because we are capped at level 4. If you go in at level 5, none of the fights mentioned should be very difficult. Level 5 is a major level where classes get a major ability (ie level 3 spells, extra attack). Those abilities are game changers.
I stumbled into the Gith encounter my first time. Gale dropped twice and Shadowheart once but I made it out. I was level 4. My group was poorly positioned and surrounded.
But then I learned how this game altered combat so I got rid of Gale and everyone carries crossbows with special arrows along with jump and misty step spells or scrolls. There’s nothing right now currently I can’t destroy.