Hopefully you learned a few things.
If you're flying HP, you alone are responsible for your flight. It's your responsibility to know what your rocket is going to do.
You are obligated to use only certified motors at NAR launches. Using a shortened Aerotech delay on a certification flight is an automatic disqualification, even if the flight is otherwise uneventful. You also put the club at risk because you nullified the insurance coverage for the club for that flight by flying an uncertified motor. If anything bad happened, you, the RSO, the LCO and the club would bear the entire cost and consequences of the flight.
Review your motor assembly technique. It is quite possible that the motor/delay was not properly assembled and that is the reason for the early deployment.
Make sure you use an appropriate ignitor for the motor. A commercial ignitor supplied by the manufacturer or another vendor is preferred to a homebrew ignitor. (I get flack for this, but that's how it is.) A chuffing motor doesn't lift of promptly and if the delay catches first, you're going to get an early deployment.
Learn from your mistakes. Everyone makes mistakes, that's how we learn. Just don't repeat them.
Good luck on the next attempt.
Bob Krech