Opposite for me as well, I can not turn of the Safe mode filter which is filtering out many relevant tweets (without any profanity or nothing), resulting in very empty timelines.
Also see my reply to the main Embedded Timelines Questions post here: https://dev.twitter.com/discussions/10633?page=23
A little browsing of the huge collection of replies to that discussion indicates we are not the only ones suffering from this. Hopefully this will be resolved soon.