Here is a photo of two calibration prints and screen shots of the Slic3r settings for speed that I used for the tests.
The test case on the left takes almost 70% longer to print than the one on the right but the quality is obviously a lot higher.
I have tried a lot of individual changes to the speed of printing but it seems that the whole thing needs to be SLOW to get the quality that I would like to achieve.
The question is...what mechanical issues are greatest contributors to the reduction of quality as speed increase?
Finally printing with some really good quality...and...SMOKE!