Thanks for the update, may I suggest the Sun Pak G Flash as the replacement?
The G Flash is more powerful than the Inons at 1/3 the price, G Flash at $180, the Inons is over $600!
So for the price of one Inon you could buy 3 G Flashes and knock out every shadow from you picture. Because as expensive as the Inon, the light coming from their strobes or any other strobe, still travels in a straight path.
The G Flash also comes with the tray and arms plus a light diffuser. Sun Pak has been making strobes for land and sea for more than 30 years.
http://www.leisurepro.com/Catalog.aspx?op=ItemDisplay&ProductID=SPKGF&kw=Sunpak+G-Flash
http://www.tocad.com/flash/gFlash.html
Dive Safe