Just a point of clarification:
The metronome is to help you develop a naturally smooth DA trigger pull. When actually shooting, though, your
sight picture, rather than any rhythm, must dictate the shot. Get a good sight picture
before mentally committing to the shot - once committed, your pull will be smooth, so your sight picture won't be too affected. But without that sight picture, a true shot isn't a given. Take a looksee at my vid below as an example - good trigger control, but with no sight picture, only the Good Lord knows where those shots would've landed.
http://www.youtube.com/watch?v=lmy5mkjpUNI