I shoot the +10 and +5 on a 105. My process:
1-Camera set to focus priority. (The camera will not take a shot unless it is in focus)
2-Camera in continuous focus mode, no delay setting
3-Strobes next to and parallel with the port.
4-Have buddy shine a light on the subject (If Pigmy shine from behind. The pigmy will turn away from the light toward the camera)
5-Get closer than minimum focus then slowly back out until the camera gets focus and takes shot
In surge it still rately works and, yes, the +5 is a lot easier