Any tri can be made to sail poorly....Usual suspects....dirty bottom, 3 or 2 bladed fixed prop, poorly cut sails
, poor sheeting/incorrect hardware
location, pinching too close to the wind
The Cross long, shoal cruising keel needs some speed to work, if you pinch and stall you'll make more leeway than you would sailing free and fast.
The overload is the big one, is the interior
with heavy cabinet doors etc....and the tanks
big enough to power half way around the world? These boats should be thought of as airplanes, not freighters if you want one to fly. Yanking a overbuilt house style interior
can be a good place to start.
Jeff Turner has study plans and plans available for these boats if you want to see how close the one you are looking at is to the design.
Pivers can sail decently if not afflicted with the above too.