Anti-alias and ambient occlusion (bad result)

I'm stuck with trying to get a decent anti-aliased result when using ambient occlusion. No matter how high I set the sample count for Anti-aliasing, the result gets very blurry when the anti-alias process kicks in.

It seems that when you enable ambient occlusion, the sampling system changes for the height input or something. I attached a filter where preset 1 shows the problem with ambient occlusion and preset 2 shows correct anti-aliasing on the height input when ambient occlusion is not enabled.

I imagine this is so because of the rather expensive rendering of ambient occlusion, but it could also be a bug, not sure.

How can I achieve a good looking surface filter result with ambient occlusion enabled?

AO AA.ffxml

Excellent! This was exactly what I was looking for, thanks