Well... Here's what worked for me.
I've read solutions saying that you have to complete a certain percent of the optional objectives in order to obtain S ranks in the fights and that is simply not true.
The only thing I did to obtain an S rank in the 2 fights of Madara's Pulse was win the fight with as much health as possible remaining and win with my ultimate/secret jutsu.
Essentially I spam YYB to launch my ultimate and charge/use support attacks while my opponent is down. If your opponent comes in close quickly substitue behind them (LT) and hit them in the back with your ultimate.
Easy peasy!