Hey Guys,
Not quite a bed height issue, if it was then it would've been an issues from the first layer.
The speed hypothesis is a pretty good guess though.
I personally thought it may have been that they turns for lifting is a bit off, but I did test that too.
Although:
Anywho, I did eventually find the problem:
It was extruding too rapidly: My extruder stepper calibration in the firmware was a bit off.
I eventually adjusted that, then tested and adjusted the extrusion rate in slicer too.
That fixed it.
Sorry I haven't updated, the forum was pretty dead for a while.