You should be able to lower the contra so the edge on the contra is just about in line with the edge of the head IT IS DESIGNED NOT TO PROTRUDE BEYOND THIS POINT-MARTIN also if leaking you would see a good bit of blowby around the compression screw
how many head shims??..Check the edge of the shim with an exacto blade to make sure 2 or not stuck together nd makw sure there is not an other one on the head
tough to see