I went to great lengths/expense in my "Audio Only" system when it comes to dedicated power lines...seperate grounds...ect, and would not like to repeat that here
After a small or large project is finished, many times we will say something like " I should have done this or that when I had the chance to ".
We have all done this one time or another, so with that being said, from what you went through with your " audio only " system, what would you do different ?
This is the way that I would look at it since you basically have a second chance and now have more experience .