Whats that green build up in 1st pic ?
Is this running your hybrid, is manifold much smaller than turbine inlet making high emp and finally whats your peak fuel, boost and soi looks like something a miss.
Even when i was seeing 850deg + on boost creep std turbo all id see on egt probe was light soot coating, wiped off probe like new under that.
You gotta be looking at 1000+ id guess to burst that probe?
Also in 1st pic i spot a carbon ring made by gasket or turbo inlet, looks like you could open port up a bit to match turbo this would help, if theres enough material in wall to allow.