Currently blazes are kind of land "mercy" it gets stuck attacking its current target and it's VERY hard to disengage with them. Basically it only moves after killing its current target and get's stuck in everything.
If y send them in straight line to attack something they will dies cause will get stuck in buildings the only way to move them is to the side of traget and hope they won't get stuck attacking something else.
Add some attack angle to them, so they won't constantly rotate in direction of shooting and can move back instead of circling while trying to disengage. Harbs usually don't have that problem maybe copy move settings from them.