So Alexa seems to be ok at 0.24, but when does it start the slant? What if you just use the multiples of 8 at a thicker layer, say 0.48, is that an issue. This is a strange one.

On your flashforge, could the heater be weak? i.e. what would happen if you feed say 100 mm of filament. Will it work ok? Seems to me you can overrun the heating ability if the feed is too fast for too long.