I'm aware of this problem. But sometimes it's not possible to avoid (because it limits creativity too much) and I found out it's possible to correct this later on in the software, eventhough it's not easy. I did not spent much time on these pics in postprocessing yet.
What really pisses me of is that Ikelite is still recommending the wrong port, eventhough I provided my informations to them and they told they might update the port chart. This is ingnoring the customers and will lead to the fact that everybody with a Nikon FX + 16-35mm will be dissapointed. I really don´t get it. It costs them 5 min to update the port chart.