I think you might be doing the exercise incorrectly. A couple things come to mind.
1) Keep your crown point suspended, straight back, neck, suspend up to crownpoint. Don't look up as you hold hands over your head, causing a "crimp" in your neck. The energy is very open in this exercise, keep your alignment through the movement.
2) As you bring your cupped hands down to your crown, you bring the energy there, then as you move your hands down your face to the base of your throat, move the energy down. In the lowered position, I am aware, again , of the energy in my hands, lower dan tien, and grounded feet/stance..
Then you start another cycle moving up. Check your neck alignment and be sure you are feeling the spine stretch a bit and align, as you suspend the crown, holding that ball up over your head, aligning that ball to crownpoint with heaven. The energy is up to the crown at that point. Opening your arms down to shoulder height, then up again is a nice open merging with heaven. Then bring the energy from heaven down to the crown with cupped hands, and continue moving the energy down the front with your hands. You may feel the warmth of your hands as they pass down your face to the base of your throat, to heart, to lower dan tien...
Keep you neck/spine/crown aligned in the stretching movement too. Be aware of how you are "moving" the energy. I wouldn't focus on the point between your shoulder blades, moving from the head. That is moving backwards from how the energy flows. "if" you want to move energy out of your head, focus on the lower dan tien. You can move, inside, down your centerline, head to heart to lower dan tien. (upper, middle, lower dan tiens). Otherwise , follow the direction of energy flow in small universe, down the front, then , into the lower dan tien to hold your focus there. Again, the exercise, if done correctly, does noT trap energy in your head.
