Translation engine should apologise for their translation, not you :smileyhappy:.
Don't know if that helps, but:
INT_CFDATAx registers are paged. INT_CFADDR register switches the set of interrupt priority settings accessible via INT_CFDATA0 - INT_CFDATA7 memory window.
It's not enough to rise interrupt priority of specific interrupt. To make interrupt nesting enabled, all interrupt handlers should reenable interrupts using cli instruction or something similar.