New Strat day, I kind of set it up my way (action was too low), I put the tremolo arm on and start playing Lenny (standard procedure when I get a new Strat), "well, it definitely plays fine", then I notice some ugly choking/buzz when I play a 12th fret harmonic on B and E strings. Also on the 11th and 13th (not as noticeable). No problem with other frets though. Can you guys help me? I promise pics.