Isn't the recommended craftsmanship of 468 just for quicksynthing, not the requirement to actually craft the item?
Also not sure if it's been mentioned yet, since I didn't read all the replies, but actual level is also something to take into account, when going from expansion to expansion (or in this case, base game to expansion)
Try doing a HW craft at lvl 50, followed by doing the same craft at 51 (getting that first level is really easy). You'll notice the increase in progress increasing significantly.