It its current state, it gives a light enough throttle, but a lot of throttle movement. Around town, this involves lots of walking the grip with your hand.
If I move the cable further towards the center, it give less movement, but the throttle is too hard.
I assume that the only way around this issue, is to modify the governer with lighter weights internally?
Just an idea: Set the mount location to the position that gives the perfect amount of travel, regardless of how hard it is. Then find a weak spring to mount pulling the throtlle open, it must be weaker than the spring pulling it closed. Move the mount location of the new spring further and further, a bit at a time until it is pulling almost as much as the other spring. Now as soon as you put slight tension on the cable, combined with pull of the new spring, it will be enough to overcome the spring pulling it closed. Obviously the same thing could be achieved by putting a weaker "close" spring on but I think it is preferrable to leave that spring as big and robust as possible to avoid it breaking from fatigue/vibration. This would be best done with a mount bracket with many holes of increasing distancer in order to "dial in" the spring forces. Just make sure the return spring is ALWAYS weaker than the new spring.
If I end up with an assist spring, its going to prevent the lever from returning to idle properly, the first half is easy to move, the second half is much harder to move.