After 24 years of flying the 76A, I've always found it best to match whichever limit reaches maximum first. So if TQs reach 100% while the T5s are low, so be it. If T5s reach 768 while the TQs are low, so be it. This way you have reached max power available without exceceing any limits.
With a C30, N1 should not get limited.
Hope Nick doesn't shoot me down!!
