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You are hitting a MAF cut. Sometimes you get a "laurel" RB25, which is an engine from a NON SKYLINE VEHICLE. The maf is smaller, and supports only about 9psi of boost on the OEM engine.
You probably have that maf/ecu, and are trying to run 10+ psi. It will run lean on the OEM injectors and destroy a piston if you keep hitting the maf cut.
verify by turning the boost down to 7psi and notice the problem is gone.
Solution is larger injectors, stand alone ECU, and a new maf/map sensor to match.
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