Looking for some guidance on Sublimated Sandstone coasters. Sawgrass SG1000, IronClad sublimation blank sandstone coasters, pressing @ 400 degrees for 210 seconds, medium pressure. I would say 3 out of 4 come out okay, not supper vivid but what I would expect on the sandstone, 1 not sure if there is ghosting on my images as they don't come out quite as crisp as a photo, or can't tell if the image is over saturated maybe due to pressing too long? Or would it be from my actual photo, (look clear on my computer) or is it the way I am printing/pressing ? Also using an 1/8 inch green pad per instructions.