Hey there, This is probably happening because the field is spawning and firing on a single frame and the force is being applied too early. I would try setting the lifespan of the field actor to 0.1 or 0.2 to allow the field to apply velocity over a couple of frames.
Also, you might have better luck skipping the field and using the ‘Apply External Strain’ node followed by ‘Apply Breaking Linear Velocity’. This is a lighter weight way to cause a break and apply velocity