FEL lifting can almost be black magic. For me - hydraulics is a mystic art form. You need to get ahold of your FEL owners manual. If it's like mine - it has loader lift graphs. How far ahead of the pivot pins and how high.
With my M6040 I'm able to lift quite heavy loads. This is because the center of mass ( whatever I'm lifting ) is closer to the pivot pins than the factory stated 24". AND I only lift high enough so the grapple does not leave knuckle drag marks on the ground.
I always lift with the 1550# of Rimguard in the rear tires and my 1000#+ Rhino rear blade on the 3-point. If the tractor starts to feel - "light in the loafers" - I know I'm at or close to the max lift.
For me - an absolute max lift is 3100# to 3200#. I would never have the capability or desire to lift this heavy a load much over 6" off the ground.