[ngoma]

Factory spec appears to be 750 RPM warm, 950 RPM cold so you are a little off.

You could continue to play with that ball stud on the cold start lever that engages the throttle lever when cold. It is fiddly but what helped me was to scribe a match line centerline on the ball stud that continued to the slotted lever it bolts to. That gave a clear visual indication of where I started from, and how much to move it. The frustrating part is that the ball stud will "walk" in the slot as your are tightening it-- it never wants to stay in the position you desire.

Just a warning: Do Not attempt to adjust by moving the stop block that clamps on the cable itself. That is important not to disturb. Specialized Bosch testing rig is required to reset that.