I am having issue with formation too, especially in tighter space just after descending stairs with straight line formation, e.g. 1-1-1-1 at the place where there's a shrieker. The last on the line doesn't seem to run down the stair and instead run back around the shrieker and got 1 shotted. I think it maybe because of the lack of space after descending the stairs. What I think Larian could do is to show the cursor of every party member instead of the one selected while moving and let us rotate the cursor like Pillars of Eternity, so we could expect the positioning of our characters.
