carto - Ordering Cartodb torque visualization over Google Maps heatmap layer

I am attempting to create a map with two layers: a CartoDB Torque visualization on top and a Google heatmap layer underneath. So far I have only been able to get them to draw in the opposite order I'm going for. I have tried calling a setTimeout on cartodb.createLayer and reordering when the layers are created. Can this ordering be done via either the Google Maps API or CartoDB? Below is the relevant code.

heatmapData = [lots of new google.maps.LatLng()]


var heatmap = new google.maps.visualization.HeatmapLayer({
    data: heatmapData,
    opacity: 0.5,
    gradient: g,
    radius: 12
    });

heatmap.setMap(map);

cartodb.createLayer(map, 'http://catalina.cartodb.com/api/v2/viz/2ed4ec6e-5f84-11e4-ab03-0e853d047bba/viz.json')

    .addTo(map, 0)
    .on('done', function(layer) {
        //do nothing
    })
    .on('error', function(err) {
        alert("some error occurred: " + err);
    });

Full code available on http://catalinagis.org/bison2