Jef,
In case you haven't flown your
Cardinal yet - looking at the video & assuming(?)

that you have set it up with the CofG as per plan, then you have
way too much rudder control. Mine flies with about a quarter of that throw and still has
heaps of control.
Of course, if you have the CG much further forward, then its less of a problem. I'd still halve the throw for the first flights.
Hope you get as much fun from yours as I have from mine.