Well this is a point of view from a veteran Tactician is a piece of cake, there is some encounters that made me reload but nothing that would make me reconsider party or anything?

Honestly Story mode if you are feeling its hard then it needs to be fixed because its basically the walk in the park mode where you just want to see the story rolling and not think about combat. Regarding Balanced I wouldn't touch it, in theory is for people that wanna see some combat but don't wanna optimize the character to the max?

Hope they do a RAW 5e difficulty in case they release a directors cut, no spells swapping unless after a long rest, Heavy armor Penalty, no respec and balance the encounters to be more tougher.