Breaking in New Anfim Burrs

Hi, I just received new titanium burrs for our anfim.  I was wondering if anyone has experience with breaking them in.  We replaced them yesterday and ran about 5lbs of coffee thru.  And since have gone thru about 2 more lbs.  Our shots are coming out sour and blonding quicker.  Also the grinder is grinding about 1-1.5 seconds slower than before (it has a timer mod).  Just wanted to check to see if this was common and if so how much coffee I should expect to grind thru first.  

Thanks.

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