Hi there,
I've been having similar issues with a particular model. It's only 1 wall thick and I've tweaked the line width to the nearest 0.01mm so it's perfectly 1 line. The minimum wall flow has helped reduce the print time by turning the fake wall into a travel but it still feels broken.
My expectation was that the nozzle would move from A to B on one layer and then move from C to D on the following layer. However, every layer prints as A to B followed by a travel from C to D. How on earth is this the "shortest" z seam alignment? Why does each layer have to start at A?