Do like Kirk did
How did James Tiberius Kirk beat the Kobayashi Maru? He changed the rules. As performance analysts, to beat the performance game Oracle sometimes allows us to change the rules as well. While relational heresy to some, the commit write facility is an in your face way to improve redo constained performance.
In a nutshell, the commit write facility is this: When a commit is issued and the client process quickly receives a "commit complete", it's not really completed... not yet anyway. So there is a possibility of loosing committed data.