Firstly, thank you!

It's funny..., when I was transcribing Makerfarm's stock config settings to Marlin 1.1.0, the Z settings really stood out. I'm not sure I correlated them with any particular artifacts I may be seeing..., they just seemed SO SLOW. Nevertheless, I didn't play with it.

One issue I've never really been able to overcome..., the one that it seemed no matter what slicer settings I used I'd get basically the same results, relates to retraction (or quasi lack of it).

This discussion I think has given me some new ideas, and the confidence to try some stuff out. So look out Z accel/jerk settings..., and I'm coming for you extruder as well.

Thx again!