Averages

Yes, somewhat. The problem here is that it is not intuitively obvious what a "total" of these YoY columns actually means. From the information you have provided my assumption is that to form the total, the measures are evaluated in the context of all three years, but that still means that the YTD for those three years still evaluates to YTD for this year, and the same applies for the previous year in order to calculate the growth. In some way, this is also reasonable interpretation of what that "Total" should mean, but I understand it is not what you want. 

The way I would go about this is to remove the total in the table as it is hard to understand what it means anyway. If the average you want is still of value to the user, create a separate visual for that specifically that also clarifies for the user what it is exactly he or she is looking at.

BTW there is probably a way to get the totals to come out the way you want, but you would have to share the definition of all measures used in your definitions above. And any measure used in those measures and so on.