Yea the PhysX collision mode generates a particle for every impact point.
If you just want 2, go back to your old setup and create an event loop. Send collided particles to another event for spawn, then send them back to the first event to wait until the next PhysX collision impact. Don't use PhysX collision mode in the Spawn op.
If you just want 2, go back to your old setup and create an event loop. Send collided particles to another event for spawn, then send them back to the first event to wait until the next PhysX collision impact. Don't use PhysX collision mode in the Spawn op.