An injection molding system (10) and method of use where the system (10) is comprised of an injection molding machine (40), a heated manifold (50), a plurality of nozzles (1 n, 2n, 3n, 4n) each having a respective gate (1 g, 2g, 3g, 4g) communicating with one or more cavities (20), each nozzle having a valve comprised of an actuator (1 a, 2a, 3a, 4a) and a corresponding valve pin (1 p, 2p, 3p, 4p), wherein the method establishes pack or fill pressures comprising: injecting injection fluid (1153) on a first injection cycle, forming a first one or more parts or objects, inspecting or measuring the first one or more parts or objects, determining an updated pack or fill pressure, injecting injection fluid (1153) on a successive injection cycle where the pack and fill pressures are adjusted to match the updated pack or fill pressures.
