I think " 从。。。来看”means "from different point of view" eg “从某方面来看，他确实是对的” and "从 。。。 来说”, because it refered to "说”means you have your own view about something ,you want to speak it out. so you express "从。。。来说"
but the differetce is subtle . and most Chinese do not pay attention to it , when you ask a Chinese this kinds of question you will be given answers like Eric gave to you .
i suggest you do not pay much attention to it,especially donot bothered by that kinds of thing , and i think watch TV show or listen to radio will indeed helps. ( its my opinion ,but it may not works for you ) hope you do better in your Chinese study