Lightroom :: Choose Right Print Profile For Epson R3000?

The subtitle should be "How do I choose the best profile without wasting a lot of time and paper?"

I have an Epson R3000 using Epson premium glossy paper. I am printing from Lightroom (and Photoshop). My understanding has been that the best color match would come from using the Epson appropriate paper profile and letting LR manage the color. However, my output, especially for skin tones had a distinct magenta color cast and really looked terrible. I spent a few hours rechecking settings and making test prints to confirm settings such as turning off color management in the printer. Finally, I called Adobe support. They were very useful and by changing the printer profile from Epson 'spr premium glossy' to my monitor (which is calibrated) profile, I actually get output that matches my screen pretty well. The bothersome part is that I came away with a new understanding that I now have to experiment with profiles when printing.

This is contrary to my earlier understanding that Epson and LR do all the experimentation and that by using the Epson printer, paper and matching profiles I can get reliable color matched output from LR. There must be a reason that printer and paper manufacturers go to the trouble of developing profiles. how to choose the appropriate profile when printing? There is the further question of the best output to send to a professional printer. Should I just set to sRGB?