I have a Ford 4600, I just added a weight bracket and 4 suitcase weights to the front of it.
I am running a 6 foot hog (Woods Cadet 72). I also have CA-CL in the rear wheels which are 16.9 x 30.
I was having trouble with the front coming off the ground when I started to turn up a hill. Especially if I was raising the hog.
I can guarantee you if you raise a brush hog and pop the clutch at the same time, you can get the fronts off the ground!
I would NOT be quick to get rid of the weights. You may just regret it.