I had the same problem and the solution is to re-route the throttle cable.With the shorter and lower m-bars the cable is forced into a bend which is to tight causing the cable to bind.
If you disconect the cables from the twist grip you can re-route through the outside of the triple tree to reduce the arc.

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07 865 Silver Bonnie....Bobbed Guards, Tacho, Grab Rail, Lucas Tail light, Mini Blinkers, Dart Screen, LSL Sport Bars, 1" Longer Hagons, 10mm Raised Forks, K&N Pods, Staintunes, 140/40 3 1/2 turns + 1 shim......etc....etc...
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