Follow the instructions in the FSM for setting and adjusting the governor.
There is a procedure for doing that and you have to start there with the carb to governor arm properly adjusted so the carb is at WOT when the governor is set.
With the governor arm loose on it's shaft and the shaft held CCW against the internal stop, the carb should be at WOT. That is when you tighten the clamp back up while holding both in that position.
If you cannot feel the stop when turning the shaft CCW, and it basically just wants to spin around 360*,you have issues inside the engine with the governor itself and that is another whole can of worms that will require some major engine dis assembly.
Once that is set, providing you can get it set, the rest should fall into place.
Is the main spring on the correct way to avoid binding or rubbing somewhere on the large end, where the coil on the spring is located?
I usually loosen the governor arm clamp & lightly clamp a needle nose vice grip on the shaft, rotate it CCW and hold it against the stop. That done and with the carb at WOT, position the arm w/the carb at WOT and then tighten the clamp. I usually use a rubber band to hold the vise grip in place while tightening the clamp.
An extra hand will come in handy here or, in lieu of a rubber band, you could have a lovely assistant aid in this task as well.
Good luck!