After a lengthy incantation and an offering of the spent D12 3 casing that did not have an ejection charge that crashed my favorite rocket, I open the Forbidden Codex of the Dark Arts of Oddrocketry. Not science, but necromancy. Not computer simulation, but dangerous mind simulation.
Hear ye, hear ye. The CP of a dastardly tall cone is 2/3rds up it's length. Those Fins bring it down very slightly, so the CG needs to be way up at 2/3rds point for first flight. Your friend of the base drag hack has abandoned you. The machine generated stability is but an illusion. Only sinful amounts of no good, stinking, performance robbing nose weight will appease the multitude dark forces surrounding the evil cone. So much lovely motor thrust must be sacrificed at the alter of stability. The horror.
Many have flown the simple paper cone with modeling clay or the motor recessed way up, but the solid wood calls the earth spirit to bring it down, back to the earth element from which it sprang. Terra firma calls back those who dare to leave her. The Mountain Spirit rumbles as the swing reveals the truth.
Power and nose weight can solve many of your problems and that ain't bad. Trust in Thrust.
Must close the Oddroc Codex, that evil tome will destroy your mind if too much time spent there.