I see in your 3rd photo the red painted spreader that comes with the kit of porta-power hydraulic jacks. I tried using mine to move what I though was an easy slide of a new wall I built in the basement, and the cast iron wedge piece broke. I made a new one from steel, after that fix, I've never used it again.
I'm impressed with your home built mini jacks. You must have repurposed some seals from a hydraulic cylinder set you had around.