Rather than using the style editor, I would try to find a style that does what you want. With 70+ style disks, there must be something that would work. There are styles that are LH piano only that are very subtle. Try entering search words in the style picker that match what you are looking for - such as minimal, embellish, simple, etc. Once you see something that may work, listen to the demo by pressing Load Song Demo from the Style Picker. Or if you are doing a standard like Misty, search for Misty demos. If you know the feel and tempo before hand, that can also help narrow your picks.

If all else fails, go back to the style editor and edit your patterns (Ctrl W).