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Makes sense, as I (am beginning to) understand it, its all about the slicer utility and parameters.

So I installed repetier-host, still using slic3r. Print time, same part, went from 1:35ish to 55 minutes. Just started a test print so I can try to do some level of comparison re quality.

Any guidance on how much of a print speed improvement going from the originally posted settings to setting everything at 50 would typically provide? Reason I ask is I had comparably similar settings to start with, brought them up to 50 mm/s as suggested, and saw virtually no improvement in print ...

I just built a Rostock v2 and had this issue a couple days ago when I did the autotune. I'd say the autotune is necessary so that the hot end can reliably hit and maintain your target temperature with little temperature fluctuation. I changed the extruder PID max from 255 to 128 in the EEPROM and ...