You need to adjust for a richer mixture, e.g. idle air closed some, main jet opened some. You need to be sure the lean mixture isn't from manifold gasket leaks or from leaks around the throttle shaft. You can use a propane torch around those potential trouble spots. No flame just spilling propane. If the engine runs smoother you have found a leak.
The book settings on the mixture adjustments are just close enough to right to let the engine run so you can tune them properly.
On a governed engine the governor will hide the effects of your adjustments unless you override the governor, or adjust for minimum throttle opening that the governor accomplishes as you improve the tuning. The main jet may need to be a little richer than maximum engine speed lightly load when you load it to get maximum power.
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