Your modifications look really simple and effective! I didn't hear about the spacer for the hotend fan before. Will certainly give it a try!
You could print Roberts Feeder mirrored in order to mount it reversed. What else I have seen is, that people don't mount their spools to the spoolholder but put it on a stand to the left. This should have the same effect as reverse mounting and you also gain easier access for when you want to change filaments.
My printer passed the extrusion test up to 10mm^3 out of the box. I have it for 4 weeks now, so maybe Ultimaker has improved some of your points in more recent units? Or I just had luck with my unit. I already heard, that Ultimaker is improving their machines quietly over time. Are those changes publicly available somewhere?
Also you describe the 'atomic' method without properly pointing to the source of this that was MostlyAtomicBob...
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