I recently flew my honest john (estes) on a D 12-5. I attached my jolly logic altimeter 3 to the nose cone with a fishing swivel and placed 4 holes below the nose cone shoulder but above where I pack the parachute. It says my rocket only went to 512 ft, but I thought that wouldn’t be right given the rocket and engine. It also said my sky lofter (estes) went 644 ft on a C 6-5. This does not seem actuate given the estimated altitudes by the manufacturer. What could the problem possibly be? Are my holes too small?