Increasing voltage above 16 - 18 is just using brute force to overcome an issue rather than fixing it. If you have done all the tune up stuff posted on this forum and there is little or no improvement then it's almost time to investigate for misaligned or out of round armature shaft bushings and possibly a not straight armature shaft. Before going there check the brush plate. Get the wheels in the air and get the motor moving in the forward direction. Using a flat toothpick or similar, gently start moving the brushes around in their brush wells. You should see changes in speed and motor sounds. The brush wells in these LTI brush plates are often too large and loose to make good electrical contact with the brushes. A pair of shunted brushes and a cautious tightening of the brush well inner diameter may help your situation.
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