Use the blue arm at 3/4", then the servo arm at 5/8", you should be able to go 100% or close. Set the throttle pushrod length by puting the throttle stick at center, and the carb arm at center, then measure that distance for overall pushrod length. This is for direct-pushrod setups with the servo in or near the firewall/engine box.
The key is not to have much movement coming off idle, then more on the "arc" toward the end of the carb arm movement. THis helps reduce the need for expo, but you'll probably still need some.