Forcing revisions and preventing complete deletion

Hello!

I'm trying to force revisions for all edits. I've checked the Create new revision option under publishing options and I've given no users access to the Administer content permission yet users are still able to uncheck the the "create revision" when editing. I tried removing all permissions regarding revisions (view included) but the option was still able to be unchecked. Is there anyway to remove the ability to edit without revisions?

On the same note, I need users to be able to delete their own work but I need to be able to see what they're deleting. Is there a way to have the delete option to simply hide it from non-admin users? By all accounts it should appear to be deleted to all except admin users, who can actually complete delete it if needed.

I've tried searching for modules what will provide this functionality but I haven't had any luck.

I'm using 8.3.5
Thanks!