I use the batteryless DMW-FL70-K on my gx8 and it works fine. I'm trying to add some more powerful pop to my work so I tried a Meike MK-300 in TTL mode. The flash just fires at maximum power and blows everything out. I can't believe there's any communication going on between the camera and the flash. I admit I'm new to this TTL stuff, but what's going on?