curious..
think it has to be done with infill angles of 0º and 90º instead of 45º and -45º to test if the infill overlap percentage really changes that solid infill too..
I think it maybe due to a change in the "start angle" of the incomming line..well, not really the start angle but the amont of travel on top of perimeter before it starts a new line..well can´t explain my self..