You also could have used a quick 1B+K or WR K for a full breaker combo at the end of the last round of the first and third sets. Good play overall. I liked your step on advantage. Asta is one of my harder matchups, personally.
Yeah, the end was messed up. Firstly, I noticed too late that my FC3B would RO and accidentally did a CE due to the lag. And then Aso RO himself with bullrush BE which I didn't know was possible.