i would just stick to crete because the wirble will just be fired up and killed by airborne.
Ya ive had simliar experiences with my wirble, the short bust duration, slow rate of fire and long cooldown/reload makes it really useless versus infantry.
Even up close you need atleast 2 bursts to suppress one squad, but most of the time even before the second burst starts the wirbel gets gibbed.
Its also not fast enough to effectivly chase/kite infantry,