An important basic to remember: It is the mind that moves qi, not the breath.
Don't get too hung up on breathing. I would say relaxing is most important, and what you are visualizing. If you are really relaxed , and focused on your inner visualization, the breathing tends to take a back seat, as does the movement. It is a nice physical sensation to coordinate it all, but you don't want to get hung up on the breathing, to the point it interferes with relaxation.
Also, there is merit in slowing down the breath. Your state of being becomes more expansive.
How you 'coordinate'(how many breaths, or in with this movement and out with that), your breathing with the movement is not the most essential part. As I said, 'it' is not moving qi. You can hold your hand out and project qi, whether you are inhaling, or exhaling.
A good exercise for practicing reverse breathing, I think, is the breathing of the universe in level I. You might try feeling two levels of filling in of your breath too. As you do reverse breathing, filling in the lower area of your torso,or abdomen and you gently hold it in, then filling up the upper section of your lungs. Breathing slow, you can take in quite a long and full breath. Slowing down the breath can really put you in a meditative state.
There is flexibility in this. I could be doing the moving of yin and yang, say ten times as slow as you, and also breath in and out more, with each cycle, even if I am breathing slower. We both can still get benefit, as our 'mind' directs the qi, within our movement and breathing.
love,
gallen
