You've got it all setup right, except having two Turned Tooth's is what's causing it to not work as intended. SC is only trying to use one Turned Tooth, which is why it took so many turns to win. I suggest getting a different weapon alongside your first Turned Tooth.
It's best to use a pet that can beat the opponent in few turns while also healing itself so it can go through 15-20 battles each day, if that's what you're using the bot for.