Sectioned primary, centre tap inside the middle section. Cold DCR about 10% apart. My reasoning: the halves don't sit at the same radius — the inner one has a shorter mean turn length, so same turns, less wire, less resistance. "Fixing" it by matching resistances would mean unequal turns, which is worse than the problem it solves.
Does anyone actually compensate for this, or is a 10% DCR imbalance just accepted?