I am having an edge curl issue with a couple of different materials. I first used an UltraFlex 15oz PET Blockout designed to prevent edge curl. No such luck. Then moved on to Roland's Roly-Poly. No luck there either. I have an image that is solid black with full bleed. Are my expectations too high for these materials? I have changed my black composition from 4 color rich black to 100% black only to reduce the ink usage and still can't get rid of the edge curl.