I used mid-lift theory for geometry- basically rocker is 90 to valve at 1/2 max lift.
Miller's advice is not how to adjust other brand rocker arms, but why you can't. None of the commercial rocker arms are designed to mid-lift (patent problem), and all reach 50% lift at some point other than 90° to the stem axis. The compromise is that when the longer (valve) lever is at 90°, the shorter (pushrod) lever isn't, and this is built into the rocker, it's not an adjustment.
