I've had the same problem with trim, having to set full nose down to be able to fly the aircraft with only one pilot. As a temporary measure I have found that it will fly level with 1.5 nose down trim if the C of G is set to -25 inches in the X-Plane weight, balance and fuel panel when loading the 2T.
It still took a bit of juggling to set the trim for level flight but made the aircraft more flyable.
Steve M.