Steve you could be onto something but here is the really odd thing to me and I can’t explain it. I had that case ingersoll wood splitter hooked up to the rear remote on my open center allis Chalmers D17 and it would retract really slow but extend ok. I flipped the direction of the spool valve on the tractor the direction of the splitter flipped but the behavior was the same. Then I flipped the hoses on the tractor and the direction on the splitter was correct and the speed was correct. Near as I can tell there is some sort of bypass in the splitter valve that didn’t like reverse flow.
Oh it was a good day here I finished filling my wood shed 16 cords to fill a 12 cord shed because I emptied it 4 cord below the floor which hasn’t happened since the house was built in 1901.
That last one is the area behind the stair to the shed chamber where I keep fire starter