Too much torque I presume. It just failed all at once after a hard launch.
Back to the stock tune for awhile... the ECU I bought from another member here was bad after I had it coded, so got a brand new one. Wiring harness had brittle, failing insulation causing irregular signals... Oh, and the EGTs were bad too.
Happy to have a new brain and nervous system in the old sled. After adaptation it's running better than it ever has.