there are a lot of questions I have such as wind speed and direction is there weather helm what are the tell tails doing? but from what I have read and if I am correct you may want to ease the out haul. It was stated that you pick up speed as th main is let out if this is correct it would seem that the sail might be too flat. it is not uncommon to over trim the main if you know any one with boats that have similar
rigs go out with them and see how they trim and how their boat performs.
Other valuable source would be the dealer or a Rigger. These are a best guess on the info in your post but as always there are too many variables to consider