Yeah that, sorry. I'm actually typing and browsing on my PS3 so... yeah. I make lots of errors.
However, I still think the best options after A+B are: 3K, throw, 3B. Throws catch step and standblock, 3K catches attacking (except Taki, X and Sets' A and Yoshi's iMCF), and 3B catches duck blocking (except people it whiffs on). B+K would be ok as a replacement for 3K except it's not as fast and doesn't lead to as high damage punishers. And if memory serves me correctly, B+K is a high.