Kind of depends on which spin you are trying (3, 5, 7, etc.) Without seeing what you are doing, I would say you are most likely coming out of your tuck too soon. The key to a cork spin is holding a tucked position till you're back on axis. Many people open up early and try to force the rotation because they are scared they won't make it. Other than that, it just depends on how you are throwing them. If you tell me what spin you're going for and how you are throwing it, I might be able to help. Also, it has nothing to do with how corked or inverted your are. The rotation will be a little different but all of them can be brought back on axis.