I’m the last person to get onto anyone for typos but I think is part of the issue, you are rushing and just hitting buttons with understand what is going on, I know that is why you are here but you have to stop and think about what you are doing and understand the process.
First there is no way you can mix 24p and 30p and not have some “issue” going out, like I said in the previous post. I you are editing a 30p timeline, the 24p has to have merged frames, it has to create 6 extra frames. These merged frames will look like interlaced. If you don’t want these extra frames your footage will play back as sped up. NO way around this.
Now why don’t you post what you sequence settings are, how you need to deliver the finished project, where or not you have made a test DVD?