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I'd suggest advancing the ignition timing 1-2°. I've read that (on Hondas anyway) every degree advanced you move on ignition timing moves the torque curve down about 300rpm. Go too far and you'll start getting predetonation, but typically 1-2° is safe. You'll hear it if there's predetonation, it generally sounds something like marbles dropped on glass.
To advance ignition timing, first make a line on your distributor and motor at the stock setting (often 16°) and the turn the distributor slightly. The direction that makes idle go up is advancing.
If you have a timing light, the flywheel has markings for stock, -2° and +2° usually.
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