[Gaz64]

The roller should start from the rocker shaft side of valve stem centre, roll ACROSS centre at half lift, then be at back to the start point at full lift.

Yours appears to start at centre, and by full lift is coming to far away from centre at full lift.

So your valve stem height needs to be increased, longer valves, a lash cap, or lower the rockers. Lash cap is by far the easiest way.

Your roller moves too far, especially since this happens at the highest load at max valve lift.

Gary