In my previous blog I wrote about a technique for improving prints called making a sacrificial tower that will improve the overall quality of your prints.
Another area where the print can get too hot is where the layer starts and end. This can produce a "zipper" on your print. If your prints are suffering from obvious zippers or hot spots in the top the best way I've found to fix it is to force the hot end away from the print for a moment. The best way to do that is to either print 2 identical copies of the object or make another object that can be thrown away afterwards, preferably small enough that it won't waste too much plastic.