To answer your question, there is no way to revert back to another version as it is part of the iOS. There are currently no options to change what you are talking about, but I'd certainly recommend leaving any feedback for apple on apple.com/feedback
Now in regards to the graphs, I can see both Daily Average and Total on mine... shows up on any view (Day, Week, Month, Year) in the top right of the graph. All views appear to show the current day total. Week view and above also show the Daily Average depending on the timeframe selected which appears under the graph title in the top left. What graph were you looking at specifically? Feel free to post a screenshot.