My point to the original post was getting someones RGB value for red will not, in most cases, help. Different brands of ink and different profiles means thee will be different values to get the same red. Red and black used to be difficult colors to hit but in recent years not so much.You received five different results because there were probably five different profiles used. RGB colors are not specific colors. Most often RGB & CMYK files are printed as perceptual. This means pretty...smooth gradients and transitions. Depending upon how much ink is put down, "pretty" colors can vary greatly! If you send specific colors...Pantone colors...to five different printers you should receive five very similar results.
A good red with dye sublimation is tough. It takes a lot of ink to build some of the colors.