Part 3 · Rudiments · Chapter 35
The flamacue is a group of four sixteenths starting with a flam, with an unusual accent on the second note, and it ends with another flam on the next beat: lR L R L, lR.
Accent the second sixteenth, not the flam.
Your instinct is to accent the flam. Keep the first flam medium, hit the second note hard, then land the final flam firmly on the beat.