150% first layer ?
????????????????????

First layer is usually 90% - I've changed mine to 100.

But having a 0.3mm first layer on a 0.2mm print does seem a bit odd.

so every 6.35mm it over extrudes.

Either that or the z-drop is ever so slightly less than it should be and every 6.35mm the bead gets squashed.

And congrats on the machine :-)
Had a look, pricey, but great looking bit of kit.