Anytime throttles are actuated with a arm there will be a change of rotational velocity relitive to the angle of the arm.
What this gives you is a lot of throttle shaft rotation for a given pedal movement just off fully closed, then less rotation for a given pedal movement around 1/2 throttle and finally a lot of rotation for a given pedal movement as you approach full throttle.
So you get a variable ratio as you move through the throttle range but in the exactly opposite way that is desirable.
I think that eccentric wheel could be a good remedy for your problem but just a plain concentric wheel may give you the improvement in throttle feel you seek as it will eliminate the varing ratio of the arm you currently are using.
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