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You may have problems with your chamber but the lube certainly is not responsible for burrs in the chamber. General cleaning will not correct a chamber burr, Did your 'smith correct the problem?
I would question your cleaning technique. What are you shooting? Bolt action? Are you using a bore guide? Have you ever dry fired? These are the number 1 and 2 reasons for chamber damage in a rimfire.
It won't take much for the end of a rod to ding the chamber and create a little burr. Particularly if you are aggressive with your cleaning. If your firing pin travel is too far or the pin is too wide it can create a burr on an empty chamber.
The lube is there on purpose, removing it will not improve your situation. In fact it will probably cause other problems. All you need to do is run a few dry patches thru the barrel after your shooting session and you will be fine.
Of course this is assuming that the burrs have been removed.
Good luck
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