Horizontal estimates for Kloosterman sums under Hecke eigenvalue constraints

We prove weighted cancellation under small-value conditions on Hecke eigenvalues of finitely many non-CM holomorphic newforms. We also obtain many squarefree integers of each sign with fixed normalized amplitude, simultaneously small Hecke eigenvalues, and a fixed bound on the number of prime factors, uniformly in growing reduced residue classes. Our questions are motivated by Xi's noncorrelation conjectures and the mixed-moment estimates of Jiang and Lau. Their estimates imply that small Hecke eigenvalues can occur together with non-small Kloosterman values. Our result retains this property with a fixed prime-factor bound, both signs, and the residue conditions. Using OpenAI's zero-free half-plane theorem for Dirichlet L-functions, we give an example with at most $83$ prime factors, normalized amplitude at least 10⁻²¹, and moduli M≤ C11/200.