Based on shopping (I haven't bought yet), it appears that if you switch to a flat bar, you are likely to be able to go narrower than with a riser, because the bends to accomplish the rise interfere with being able to move the grips/brakes/shifters more inward. So, it might be a possibility if you still feel too wide after implementing the suggestions above. Remember to not cut your bars so short that you don't leave room fpor bar ends with your grips of choice.
I use Ergon grips, and have used other oblong grips as well, and they are a great help for me.
Moving your hands in has the effect of allowing you to be slightly more upright, but if you still feel too stretched out I would agree that a shorter stem may be in order, although height of bar has an impact on the feel as well..
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Slow Ride Cyclists of NEPA
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