For a fixed positive integer $n>1$, we study the prime powers $q$ coprime to $n$ for which all monic irreducible factors of $Φ_n$ over $\F_q$ have the same coefficient Hamming weight. Cyclotomic orbit coefficients give a finite, effective classification of these fields. Outside finitely many computable characteristics, every factor has the support of its characteristic-zero orbit polynomial; the uniform condition $p>2^{\varphi(n)}$ suffices. In each remaining characteristic, extension exponents reduce to divisors of $\ord_n(p)$, and an integer variance identity expressed by polynomial gcd degrees decides equal weight. The same coefficient data determine the full weight distribution. As an application, we prove that an MDS constacyclic code with an irreducible generator forces every irreducible polynomial of the same root order to have full support, including factors associated with different constacyclic constants. This yields a uniform gcd and norm obstruction. We develop its short-multiplier extension, give a prime-order cubic family, and establish an explicit quadratic-residue exclusion without a prime-square alphabet or a near-square length hypothesis.

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