Heads are new Edelbrock and rockers are new Comp Cams Pro Magnum. The roller tip starts in the middle of the valve stem (slightly toward the rocker shaft) and rolls away from the rocker shaft toward the outter side of the valve stem. Does not look like an ideal scrub pattern. Anyone ever seen a case like this and know if it can be improved? I would like the scrub pattern more centered on the valve tip if possible.