I've been playing for about three months now and everything I send up with stock KSP runs without a hitch, so I decided to start playing with mods. I'm trying to create a somewhat basic science Mun lander but I'm having stability problems. I'm trying to launch this: My initial design was this rocket: But during my gravity turn, also about the time the rocket broke the speed of sound, the rocket would tip over and start tumbling. So I tried this(initially without the fins): Obviously I don't know as much as I thought as this rocket had similar issues. By adding the fins I was able to successfully get the rocket into orbit and to the Mun but the rocket will only go straight up until about 20k altitude. This makes the gravity turn rather less efficient. I suspect something is missing in my knowledge of FAR or Kerbal rocketry in general. I've searched on the topic but failed miserably at finding answers so I'm coming here for assistance. Thanks in advance!