Wow, several things on the DO NOT DO LIST. No ballast on the rear which would have been very helpful. Bouncing the tractor while perched on the front wheels, bad for front axles, FEL and tractor frame. Letting the load shift back onto the tractor, very dangerous.
Glad you got it out but it would have been much easier to just put on an implement on the back, hook a chain around the clump and pull it out using the drawbar.
You were very lucky not to have damaged your hood, turned over the tractor or worse.