QTR-Quadtone RIP

Hi,
I am using K3 ink with QTR on a 3880. Should I still convert my images into Gamma 2.2? I have read for conversion is needed for K7 inks. Do I need to do the same for an optimal print?
Also, regarding linearization. I have made a custom curve using a RAW curve and after all steps my custom curve now shows a linear response. But when you open it, it still shows a "Linearize" line.How many times can you linearize a curve? 


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