Why don't you take a photo of your camera set up as you use it for us to look at. Odds are your major problems are strobe placement and/or your internal flash.
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Where do you get those long flexible arms??? Mine is barely half that long...
DiveMagazine:Bendy strobe arms are nothing new, but until now there haven't been any available to fit the Ikelite range of underwater camera housings. With the introduction of the 40cm quick-release flexible arm, manufactured by ManFishPhoto and distributed by BigBlueSquid, Ikelite housings are now being catered for. Designed to be easy to fit and release, the arms also allow the strobe to be positioned in any position, which is useful for creative lighting techniques, especially in macro photography.