Doug,

I don't think it's necessarily a bad thing. The "X" measurment may also indicate that one hull is slightly further forward than the other but that kind of variation is pretty typical coming out of the mold through the manufacturing process at that time. It might even be that one hull is shorter than the other.

You actually want your bows to be spread out a little further than the sterns. When you tighten the rigging and under sail, the bridle wires tend to flex the bows in a good bit. I can't recall the measurement but you should rig the boat and put a good bit of mainsheet tension on and remeasure the distance between the bows and the distance between the sterns to see how it changes. Then modify the non-rigged adjustment so that when it's rigged everything is even.

Some previous owner of the 6.0NA I owned put a cable running diagonally under the tramp from the starboard end of the rear to port end of the front beams. It had a turnbuckle on it. The only thing I could figure that this was for was to adjust out any racking present in the hulls and beams. I really don't think it's important enough to go to all that trouble but if it concerns you - you might consider it.