The measure I've been having trouble with got resolved this morning. Last lesson it was explained to me but didn't sink in until now. In measure 5, the two 32nd-notes lead into the "Bb" which is on the down beat (2nd beat).
Knowing this simplifies the measure for me. It's like two grace notes attached to the Bb. The real melody comes out in the syncopation on the (+) following the Bb.
