With that lift spec, the sweep should be less than .032" when properly set up. add in about .015" for a roller footprint, and the width of the stripe should measure less than .050". It looks wider than that to me. It is centered nicely, but that doesn't mean good geometry. It just means the rocker fulcrum length is long enough (actually too long) to put the roller on the center of the valve with the fulcrum being to low. When the fulcrum (shaft) height is correct, the roller on that rocker would be too far toward the exhaust side of the head because of the extra length. That means the shaft would need to be offset more than would be necessary if the rocker was the right length to begin with.