We have a Heidelberg SM74 Six Color with coater and Alcolor Dampeners. When printing large areas of Pantone Colors on uncoated sheets the Pantone looks mottled with each successive unit. Such as when we print a solid in the last printing unit and don’t use the coater the Pantone color looks fine. But if we print the Solid Pantone color in the 4th unit then another color in the fifth and sixth units the Solid Pantone that was printed 4th unit seems to pull off on the fifth and sixth units and give a mottled appearance. It seems as though this began happening when we went away from film and started using Thermal Plates. Has anyone else experienced this problem and what did you do to remedy it. Any help would be appreciated.