Trying to make pink

Is it safe to assume that you are not doing anything related to Printwear (this is the category you have placed your question in)? Is it also safe to assume that you are trying to accomplish this with a Gerber Edge?

If my assumptions are correct then you should choose a spot foil from among the spot reds you have on your shelf or go back to process magenta and apply it as a spot color. Next set the percentage down to the range of 15 to 30% for whatever shade you want. next set the halftone pattern to Classical Dot at 70.7 LPI.

Now print out some swatches at different settings and with different foils to find the one that suits you.

If you make your settings for process rather than spot colors, then whatever profiles you use when outputting will come into play and shift the colors .... hence the purple shift. You should probably stay with spot color settings.

If you need to print using CMYK process, then pick a pink you like from the built in Pantone presets and do your outputting by manually selecting the color profile name "Gerber Edge II 300 DPI CMYK" instead of letting the GSPPlot do the selecting automatically. I would still recommend using the Classical Dot halftone at 70.7 LPI and printing test swatches.