I'd assume that adjustment isn't the issue. The pins are spring loaded & the levers go over center. That means the springs are keeping constant pressure on the pins. Combine that with the wedges on the top & angle on the pins keep the SSQA tightening as it vibrates or wiggles.
My first set of pallet forks from Titan was similarly out of spec. The pins only barely engaged the holes on the forks. They refunded some of the price, in theory to have a local welder fix things. I just welded some bar stock to the bottom of the holes so the angle on the pins would have something to grab on & tighten up the SSQA.