Hey Mike,
3 things that you can check:
1. After you make your changes, are you syncing?
2. Are you using the "Add to Method" button??
3. If you are either Syncing, or using the "Add to Method" button, make sure that the activity type you are using is setup to sync over to Method.
You can configure this by going into the Method Outlook Plug-In setup, and clicking on "Appointments".
Hope this helps!