Load All
I used to have one. The loader is not adjustable at all, so the secret is to adjust the load itself. Your load sounds a touch too tall. Check the load manuals for one using your hull/powder/shot combo with a different wad, perhaps it will be a better fit. Or, keep the shot/hull/wad combo and look for a load with a less bulky powder, so the load column is a little shorter. When finished, your crimped hull should have a small rim standing up, a half mm or so is all it needs. That will stay closed as long as you want.