You've created 4 discussion threads on this subject, and you still haven't shared the actual clips you're working with.
At the very least, take a screenshot of your project's timeline and let us see what your preview window looks like. Save the screenshot as a JPG or PNG and use the Attachments button below the forum's text box to upload it here.
You can even share your whole project so that other people can see the exact edits you've tried making and can probably make the necesary adjustments to help smooth everything out. To do that, use Pack Project Materials and save everything to a cloud folder on OneDrive or Google Drive, then paste a shareable link here so other people can access it.
If you don't have access to a cloud folder service, send me a private message and I'll give you a link to one of my accounts.