Just saw your post.
Bravo on your rear weight...that would have been my key advise.
Am not surprised it worked for you because you were planning on using forks. This allows more payload than if you were going to use a heavy bucket and chain hooks.
I lift 2800 lbs with my 5030 by removing bucket and running a shaft thru the FEL brace pipe and chaining to the shaft. Can't lift it more than 1 ft or so off the ground but that's all I need. Gets the leverage as near to the tractor as possible, minimum FEL weight, max payweight.
Helps to have max pressure in front tires... keeps them from rolling off the rims.
A properly weight balanced 5030/LA853 system is a beast, properly driven on good ground. The HST allows extremely slow movement while allowing PTO RPM's which keeps plenty of power to the hydraulics and wheels. I consider HST a major safety feature when doing exactly this...lifting major weight and placing it exactly where you want it.