canoetrpr,
There is one difference between some boxblades worth mentioning here and that is whether or not the rear facing blade is solid or hinged. This feature makes a large difference in how they respond in both directions. It looks like most of the thread responses so far are for the solid, more common type so if yours is hinged, you might post that fact as well.
One thing that helps me is to avoid the temptation to jump in and try to level the ground with one pass.
Instead, I try to knock down all the highest points first and, if practical, move the high point dirt to the lowest areas. Then go back and do the new high areas and fill the new low areas. And so on until the ground is pretty flat overall. Otherwise, as the front wheels go up and down on a rough drive, the boxblade is going down and up in response, alternatively leaving gouges and dirt piles not necessarily where you want them. Then on the next pass, it gets worse, and so on. Once you get the whole drive reasonably level, its easier to do the final grade.
Also, the two compact tractors I've owned had a hydraulic valve under the seat that adjusts how responsive the 3 PH raises and lowers. If yours has one you might check to see if setting it faster helps.
John
