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I'm sorry for the loss of your engine. Did you datalog your session while on the dyno? If so, can you upload it so it can be reviewed? Do you have a copy of your tune to upload so it can be reviewed?
There are so many other variables like oil pressure, etc it would be almost impossible to diagnose remotely. The commanded air fuel ratio seems fine, the advance is very low for that boost level with 98 octane too, it doesn't appear you should have a problem. With it being the rear cylinders I would only suspect it had something to do fuel delivery (volume, pressure, etc).
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