The only music I could think of now would be "Dart Battle" from the Stargate Atlantis Soundtrack, but maybe it's still too fast for what you are searching for.

Over a year ago I also tried to give the lightsaber fight in ANH some music. My aim was to give it more energy, so I of course used "Battle of the Heroes" and "Anakin vs. Obi-Wan". In my opinion the result is okay, but I understand that your attitude that fast music doesn't match it. Just for fun, here's my edit:

EpIV: Lightsaber Duel