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It's possible this is intended - an "audio" or approximately logarithmic taper. I don't see any obvious jumping that would indicate a bad pot.
Is this the original pot? If not, it may have been replaced with the wrong one.
If you can measure the voltage range at the wiper, you might try disconnecting it and substituting a power supply that lets you adjust the voltage over a somewhat larger range, just to see if there is more gain range available.
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