[3RRL]

Bending the rod on a hydraulic cylinder is not good.
They're not designed for that. It's all linear load. If you're bending the rod then there's a bind somewhere that causes the rod to bend. In other words, if your cylinder is bending at full dump, then the pivot must be hitting something to change the load from linear (directly pulling or pushing in line with the cylinder) to a side load onto the rod. Another example would be like the cylinder wants to extend more but can't because the pivot is binding or hitting something before it gets fully extended, so it wants to bend.
Check to see if that's not the case.