Eagle machinery models all come delivered with the pump running full on which is why the noise level is so high and resulting in quick hydraulic movement. As Yard Toad mentioned adjust the hydraulic pump, you go in your transmitter settings and adjust your end points. Pick up some hydraulic sealant and put some on your fittings and tighten everything up, this will help stop the leaks. Sounds like you have air in your lines which can cause your cylinders to slowly sag.
This should give you an idea what the dozer is like when properly tuned
https://youtu.be/csjacTuWigA