22Kohm instead 20K

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22k would be within 10% anyway, there would be no difference, especially since it is a pot and will probably be nowhere near the limit anyway.

If you want more power, you will need to up either the gain or the input signal level, use higher voltage rails (and devices that can handle it), and more power transistors. However, there is a practical limit before the circuit will need more design changes.
 
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