Here are the results of the septum heating vs Right Current study. Riasing the current only bought us about .15K bringing it up to 300A at 35uA.
Septum current upper Coil T lower Coil T. Yoke T
275A 7.57 7.00 N/A
300A 7.50 6.97 N/A
Nominal 250A 7.65 7.07 5.41
I was reading the wrong Yoke temp for the first two.