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First, i have not had a lot of luck with the mirage on an outboard, too much blade surface. Now the Mirage plus works much better than the original Mirage on an outboard, but if the boat were mine, i'd probably try a Laser, its designed to give more bow lift, and you can run it higher on your plate, if a laser is not available, try a simular prop with some rake to it.
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I've tried two different mirage 21p props, same part number, but an inch difference in diameter (one 14 1/4", the other 15 1/4"). Neither is optimum for this boat/motor combination. I've got a prop that I think is a laser 22p, that I was running on my flats skiff, and it performs a little better. I don't have a jack plate on the Seacraft, but this prop didn't mind surfacing on the other boat. I'm gonna raise the engine another inch and give her a try.
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And before you go any farther, put a straight edge on the hull bottom, make sure you don't have a lot of hook in it, if the boat was ever on a roller trailer, or on a trailer that wasn't set up right, it could have hooked the hull, don't be suprised if you see a little hook, its probably normal, but any dips or excessive hook could explain the whole problem.
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Hull's pretty straight. Only about 1/8" of hook in 4'.
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And by the way, what are you using to check your speed?
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GPS
BTW, you sound like you know a little about these black motors. I've disconnected the timing module. What's the maximum advance I can safely run if I keep the WOT rpms under 5600?