New owner here and I would like to add some stats to this post from my owners manual for the OP to compare with his tractor's stats.
My FEL has a capacity of 2,761 pounds at the pins, at a height of 107.8". Also according to the manual, I need a counterbalance of 1046 pounds at the 3PH pins to compensate.
In my current state with loaded rear tires, 710# rollover BB and 550 pound grapple bucket, my weight is ~ 7,250 pounds. I just built a frame support for a Bostich FatMax 28" toolbox right behnd the back seat so lets add another 100 pounds for the tools. Front tire pressure is at the loader maximum of 45 pounds and the rear are at 18 pounds, as delivered by my very knowledgeable dealer. My rear tire prints on a level, hard surface are great in this scenario and I see no reason to change them yet, even though the operator's manual suggests 35 pounds. I have read way too many posts on TBN with the folks suggesting ~ 11 - 12 pounds in the rear tires, so have no intention of adding more air.
I have not lifted any very heavy loads yet as I am still figuring out all of the dynamics involved, but have lifted maybe an additional 350 pounds or so, several times. Once was lifting a large, downed oak limb I scooped into the grapple bucket with the tractor pointed downward on a 10 degree or so slope. I then backed up that same slope and moved the limb across the slope and then turned left, down to the dumping point. My tractor never felt tipsy or insecure in any manner.
With nothing in the bucket I whip the tractor around pretty comfortably now and have been using the scarifiers on the BB to rip out some large, invasive roots of some type that are climbing my trees. The tractor is moving around a bit as the roots are grabbed and then break free, sometimes bringing the tractor to a complete halt quickly. I have never felt uneasy with how the tractor was handling.
I am learning I have to make a conscious effort to watch out for all of the trees on my densely wooded property... I am finding the FEL to be a long ways away from where I am sitting and it tends to meet up with a tree on occasion as I am watching my rearward travels setting up the BB for another vine root run. But still, the tractor never feel unstable.