Jason,
For a track'ed Z, we recommend atleast a 25 row core. In your case, given your local, I would even go so far as suggesting a 34 Row core if you plan on doing repeated track events. I hate that you had an issue with your Z.
Did you speak with anyone here at Z1 prior to you making your purchase? Let me know if you decide to upgrade to a larger core. I will do what I can to get you the best price shipped so that you can make the track this weekend. I have both 25 and 34 Row Cores instock and can ship today. Via standard ground service I can get you a core by Thursday/Friday without requiring any expedited shipping.
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