To all,
I was discussing this topic again the other day, and realized I hadn't thanked everyone who contributed to the thread.
Nick,
I think I've got it now. I was focusing on N1, but turbine inlet temp was rising at the same time. It's just that in the Arriel powered S-76 T4 is never the first limit we run into in our normal operations, so I wasn't paying very close attention.
-Stan-