For one thing your gearing is way to tall 11/34 = 3.09 to 1.
Good gearing for Bonneville or a rider under 75 Lbs.
Out of the box that kit peaks at 7,800 rpm's and pulls strong at over 9,200.
Gear it down and play with the timing to find where the pipe hits best and plug chop the full carb rang.
With your set up you shod be hitting hi 50's.
Get off the clutch and on the powerband.