Even though you have a new band if the drum is warped or out of round the braking will not be 100% until the shoe material wears in to the drum. The bolt could be bending due to the pressure applied. Remember these are designed for kids, an adult is capable of applying more pressure. If the drum is not trashed the break should wear into it in short time. As far as the idle, spray some WD40 or carb cleanner around the base and manifold to check for an idle change just remember to control the spray so that the overspray is not sucked into the carb inlet for this will give you a false reading. Also check your spark plug for color. If your vacume leak is that bad to keep the idle up that high, 1 it should surge at top end 2 the plug should be white. I still think along with metalstudman that your problem is in the govenor.
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