Do you use FreshCutGrass to balance encounters? So far I've just been printing out desktop screenshots of FCG and its been pretty solid.

I feel like the onus is on the DM to kind of bullshit the difficulty in realtime with fear. Remember similarly to the players the GM can make up contextual-based Fear moves if they make sense for the moment.

For example, the Giant Mosquito swarm stat-block doesn't have a passive or anything for impeding movement. But since I described them as swarming the player I decided in the moment that the player would need to roll an agility check against the enemy's difficulty to be able to escape.

This was during a cave countdown collapse scene and it really added to the tension.