I know this isn't quite an answer to your question, and you probably are not looking to spend more money. However...
Have you considered an adjustable stem? I'm quite taken with mine. It stays in the exact same place greater than 90% of the time, but once in a great while, depending on the type of riding/weather/etc I'll displace it up or down 10 degrees and then just rotate the bars appropriately.
It has a range of travel of +60 to -10 degrees, in 10 degree detented increments.