Walk from Gridcell mid to the next

Hey helpful people,

i tried weeks to overcome this obstacle, but i can not find a solution by myself.

I want my spawning AI to move from the Gridcell middle to the next one till they reach their destination. It is a TowerDefence Game and it would makes it look a lot better + the Towers can attack them equaly. For now they just search the best and quickest way to the target (take a look at the Screenshot) via NavMesh and a simple AI move to Node. Maybe i can implement specific Rules to the NavMesh? I already tried to reduce the moving cost of the middle part via tiny collision Box and a NavModifier, but this wont work (so far).

I am thankful for any ideas, blueprint screenshot or though you guys might have on that topic.

The default character movement component is not intended to be used for grid based movement, as far as I know.

I suppose that you have to implement your own logic for this.