I can't muster enough power for some recordings. 1/16 of 400W of power is a ton of light. Why can't I zoom out to 1/128 as the trigger indicates. At 1/16 the flash stops and doesn't advance. Also, about 20% of my shots didn't include a flash. I am using an XPro-S trigger on a Sony a7iii. With the simultaneous use of up to 4 Godox brand lamps (it even happened with 1), in about 20% of cases none of them blinked. It was totally random. Sometimes it was the first shot in a series of 5 shots, sometimes the last. This is on low power and the reload time was not an issue. I was able to "testβ much faster than I was shooting. My 2 closest flashes were about 2-5 feet from my camera. My other 2 were 5-10 feet apart. I can't find any definitive answers online. So if the manufacturer wants to help me fix the problem or give me an explanation, I'll return 5 stars. I have 2 SK400ii, 2 V860ii, 1 V350 and 1 AD200. I'm very happy with Godox, but the misfires are too big to ignore.