The top part of that diagram - throttle stick and carb arm in idle positions, servo arm is pointed nearly straight at the engine. Extreme mechanical differential for sure, but it's just what the doctor ordered for these gassers! I start my setup there at the idle, then work out from there. Might be a little easier than starting at half stick/half throttle?

You're doing good! Took me a LONG time to figure out that engine is pretty much all in by time the throttle is only maybe half open. That was the hard part, but I screwed with this issue quite a while, trying this and that prior to coming across these diagrams. After studying them for a minute, it made perfect sense. Been using them since!