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I'd definitely do a boost leak test. I think the idea is to check the intake hoses so just pressurize it up to the engine. If you pressurize the engine it's a leakdown test. I think the EGR block is causing the MAF readings to be so different but can that cause limp mode by itself? I can see how the MAF and boost suddenly drop off when you went into limp.

Are you chipped? Why does the MAF specified call for 850 when the engine is off? It looks like it never moves. It should be low when the engine is at low rpm and go up. I think those tuning boxes can play with the sensor readings, is it removed now?
 
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