I am surprised that the OP's tractor doesn't have "fast dump". My XG3025 has it.... if you move the joy stick all the way to the 'dump' position, it dumps almost with no restrictions.... really fast -- like entire bucket fast. After this, it will have the 'floppy bucket' until it is cycled through again.
When I first got the tractor, I actually called the dealer because I felt there was some type of restriction on the dump position.... if you try and dump it slow, there is definitely a load put on the hydraulics and engine. Not a lot, just an audible change that it's under load.
I can dump 'normal' and no floppy bucket.... do it fast --- there it is swinging for a minute.