Problem with ABABABB repeat pattern

I have a song I'm working on with an AB AB AB B structure. There is a very short intro, then it repeats. The repeats on the AB AB AB are not working properly (the right end repeat bar is in the middle of a measure and the playback ignores it). I also don't know the best way to annotate the last B repeat.Should I use DS al fine?? I recall that there is documentation on how to do that if I google it. But is that the best way to do it?

Thanks for your advice and counsel.