From what i understand making the ship top heavy doesn't t help. To help you can press the modifier key (alt) and f12 and bring up the cheat menu. Then go to the aero tab and turn on an option that says something like, show aero forces. With that you can see the forces acting on the rocket, its represented by arrows. if the arrow show too much force one way then the air is pushing the nose down because of the weight. I hope i explained this well but Scott Manley made a video on this as well.