In your initial design, Make sure the fins are swept back. Moves the center of pressure behind the Center of gravity, 8 times out of 10. It's a cheat, but it works most of the time. Also, you can extend the length of your rocket to keep the center of pressure behind the CG, or to correct a problem with that. Adding more weight to the nosecone can push the CP behind the CG, if needed(last resort). ALOT more to take into consideration when designing, but those are "cheat codes" that can help you get unstuck, if so.
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In your initial design, Make sure the fins are swept back. Moves the center of pressure behind the Center of gravity, 8 times out of 10. It's a cheat, but it works most of the time. Also, you can extend the length of your rocket to keep the center of pressure behind the CG, or to correct a problem with that. Adding more weight to the nosecone can push the CP behind the CG, if needed(last resort). ALOT more to take into consideration when designing, but those are "cheat codes" that can help you get unstuck, if so.
epic