Base vs Borderline Spark Source?

[06300CSRT8]

Noticed pretty much every time I cross 6400rpms going WOT my spark source switches from borderline to base. Where is that changeover coming from? What does base timing point to in my tune?

[Dev1360]

Lambda Spark, IAT Spark, and ECT spark are all modifiers to make it sit in base. Cylinder Offset can also do it.

I had too aggressive of a lambda adder. Turning that down allowed the car to add timing and stay in my borderline tables.