Since you live in Mississippi and like Magnatec, why not consider GTX Magnatec 10Wx30 Full Synthetic?
According to the Castrol website I recently checked :
10W30 Noack is %6.95 ... very low Noack for the price!
5W30 Noack is %8.9
I'm comparing the NOACK between Havoline full synthetic 5w30 Pro DS and Magnatec full synthetic 5w30. I can't find the data for the Magnatec. Anyone know what it is?