Playing alternating flams demands a certain amount of chops. Playing fast hand-to-hand flams require a different kind of chops—whipping Moeller strokes. If you can master the technique needed to play hand-to-hand flams at all tempos, your accent/tap motion will become much stronger and faster while requiring less energy.
A flam is simply a grace note tied to a main stroke. The primary note has metric value and should land exactly in time. The grace note is used to add texture and thickness to the sound and should be placed just before the primary note.