The FEL represents about 1200lbs out in front of the front axle. The front axle acts as a fulcrum, and the rear wheels are being lifted by about half - maybe more - of that weight. You want filled tires, maybe wheel weights, and a ballast box or heavy implement on the 3PH to counter the weight of the loader, plus any load in the bucket. Since about double the FEL + load is on the front axle, use 4WD - the rear end may have little traction.
Keep the loader bucket as low as is practical with any load. Always be ready to force or float the bucket down to the ground, at the first indication you are unstable. I'd advise practice. When you pick up a load, you usually curl the bucket. If you continue to lift the load, particularly if you are inclined up, the load will dump out of the bucket backwards, ruining your tractor hood, and maybe killing the driver. If you have a side incline as the bucket rises it will tip you over to the side. When it happens, it happens fast. Be ready to force it back down as fast as possible.
The loader has pict-o-grams of these hazards on the frame - study them, learn and beware!
It only take a couple of minutes to remove or attach the whole FEL, or just the QA bucket. If you don't reckon you will need it, take it off.