This is basically my assessment too. Good write up :)

Thank you so much. As a Relay fan, I’ve been looking for something to fill that space. And lift off wasn’t quite doing it for me.

Unfortunately that has the same issue as well. These triangles are due to the 3 closest perimeter lines meeting, thus concentric ends up with the same issue.

Direction specific force loading. In this particular instance, Having it run the infill along the perimeter of the part would improve it.

Yellow is perimeter lines, the goal is to not use infill at all, and to just use multiple perimeter passes.

They dramatically increase print times and increase blemishes. It’s such a small surface area, that it just ends up creating blobs and shakes the printer.