Hi Cvetan -
With no ice limit, and boats that can do 40+ kts, I think we're encountering scenarios you haven't had to deal with before.
You have an outstanding ride going. Possibly a winning one, depending on what happens after you reach New Zealand. But I'm guessing you can't run a good routing right now beyond about 10 days... because if you put a waypoint past NZ, it'll route you toward the nearest local Antarctic coast or on a Westerly route. In other words, it's a problem that we have boats that can get half way around an Antarctic circumnavigation with no ice limit under 16 days.
Is there an easy solution? For example, could you place a gate at Cape Horn that the router will simply refuse to pass in the wrong direction?
I have a specific reason for asking... I'm not sure if it's relevant in your case or not. I have a decent run going, but I'm going to fall off the back of the system that you're on the front of. Sometime between January 4 and 7, there's going to be a nice window for new starts. I'm going to have a difficult decision to make about whether or not to re-start at that time. I'd really like to be able to run a routing to Cape Horn on January 3 to make that decision. But I don't think I will have gone far enough by January 3 for that to work yet. I think it will still want to show me the "wrong way" routing.