The pistol won't extract the spent case from the chamber but it's not an extractor problem?!
Maybe you need a new gunsmith... You can check the extractor yourself. With the slide off the pistol, and held upright, take a loaded round and slip the rim of the case under the extractor and let go.
Does the round stay in place or fall? If it falls, you have too little extractor tension.
Also, examine the extractor hook itself and see if there are any chips missing from it. Is the groove, which creates the hook, deep of shallow?
A new extactor should be less than $20 and you could always remove yours and take it in to the shop to compare to a new one before buying it.
The sole other possibility that I can think of would be a rough chamber that's causing the case to stick and the extractor is slipping over the rim. In that case there should be some obvious dings in the case rim though.
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Make mine lean, mean, and 9x19!