I'm not suprised by the addendum. Considering they market the ucd series as a 3d trainer, I'm sure they initially set the balance point well up towards the nose to make it more docile. Then they probably got a lot of a responces from ppl that the cg needed to be further back to fly 3d well, so they put the addendum in. That would be my guess anyways. Think of it this way. Now u can slowly shave off weight till u find where u like the balance point, starting from a safely nose biased starting point.
-John