One of the objectives of the Plasma Radiation Source research program on the Decade Quad machine (6 MA, 300 ns implosion time) program is to optimize the K-shell yield for large-radius, long-implosion-time argon gas-puff Z-pinches. The NRL HAWK generator (0.6 MA, 300 ns implosion time) driving a neon gas puff is a convenient test bed to study yield dependence on density profile, implosion time, return current symmetry, etc‥ Neon on Hawk is energetically equivalent to argon on Decade Quad [1]. The HA WK neon experiments employ the Titan 1234 double-shell gas-puff valve and nozzle [2] used in higher-Current argon experiments [3]. Here, we report on experiments to determine dependence of K-shell yield on gas-puff density profile by varying the inner and outer plenum pressures over a wide range.