Von, the front end should only be light when you pick the mower up, shouldn't it? I can tell mine is lighter when I lift the mower, but it's never seemed light enough to worry about; however, those weights are not a bad idea at all. With the front end loader so far out in front, and heavier, too, it makes the front end bounce on my rough terrain (one of the reasons I always leave it off), but a hundred pounds in close that way shouldn't do that. I might have to try putting some on mine.
Bird