I definitely agree. Printer icc profiles vary by paper batch and by OS drivers. It is a real world issue. It is why I decided to invest in the Datacolor Spyder 4 Elite system so I could do full screen calibration and printer/ink/paper profiles. I found that there were significant difference between paper manufacturer's batches as well as smaller differences between CIS ink batches. It is one of the reasons I bought a CIS (Continuous Inking System) for my printer as then you have a large batch of ink compated to a printer cartridge. Yes cartridge to cartridge variation can be large as well.