My MC has the tub cut out, but it runs the stock motor and ESC. The bottom of my strut is about 3/16" above the sponson bottoms and flat. The packs are well back too. I'm running an m445 and seeing high 40s with good quality packs. Since all the power in an FE boat is in the packs, cheap packs may be a source of lower speeds. Your prop is a bit low in pitch but with those packs it may be the best choice.
Blueprint the sponson bottoms with 320/400 grit wet-or-dry. Try raising the strut and angling the prop end up a degree or two. These changes may coax a little more speed out of your current setup.
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