The dome of the conservatory is overexposed, even with highlights set to 0 in LightRoom 4 (just upgraded from version 3)

What a correct exposure of the dome looks like. The foreground is wrapped in shadow.

Exposure +1.25, and Highlights -84 (trying to lift the foreground without losing background detail) and Shadows +14. I could do a little more shadow pushing, but it becomes noisy.

Pushing shadows all the way (the bad effects do not really show at this web size), this is what I would like the shot to look like.

The bad effects can be seen in this 100% crop:

Noise reduction works at the cost of the fine detail (e.g, the fine veins in the leaves are lost).