No, just the policy mod, and I don't think that has any affect on this issue.
Nope it would not have anything to do with it.
Not sure where you all live but it all depends on network coverage and usage. If you live in a small city/rural you may not have the same strength as someone in a city.
Sometime this month (no date set yet) there is supposed to be a TV update that will fix many of the issues. Don't hold your breath but there is that. If you have had the phone for a while many of us have experienced better or worse TV after the previous updates.
Your best bet is to sideload movies and TV shows. Then you control the quality and what you watch. It is awesome.