Checked session. mXr Asy 18 is awesome. Wanted to sail it with 5.6 as I only tried them in conditions that were too light for the 44cm board and 18cm asy fin. Even when we only had best gusts of about 30 kts which is nothing very special, I've seen a piece of the true speed potetial and a confirmation of the very secure behaviour at high speeds. Fastest run and highest peak with the smallest  sail of the pack....But I'm sure we haven't seen anything yet!!