I had similar problems, when printing with PLA objects with layers, which take only few time.
I think its not a problem with the extruding temperature. The problem is, that the layer down isn't stiff enough, when the next layer is printed.
In the cool script of Skeinforge there are some settings to deal with this problem. Orbiting doesn't work for me. "slow down" is better.
Nophead mentioned an alternative cool script. This script can activate the fan for fast layers. I installed it and it worked perfectly for my problems. But I can't remember where I found it in the Web.