Thank you for your respond
and yes my Head was tilted, it is normal after turn the head forward
for the second issue. No i have not used my flash with PW before
when it trigger slow or not trigger at all, the picture is almost to totally dark depends on the setting and ambient light. (not half)
I did few more test with flash head pointed towards the camera and with 2 flashes both 580exii and 430exii
when i use 1 second shutter speed, did about 10 shots, flash fired and not recorded, i believe its firing before the shutter.
used 0.5 seconds, same as 1 sec, its firing before the shutter.
but there is once during the test 580 did not fire and 430 fired right after shutter closed.
and tried with P mode later on at 1/60 f4.0
the results are
1. 40% of the time flash before the shutter opens
2. 10% of the fires after shutter closes (not sure if my eye is right but it seems the flash flashed at lower power than normal)
3. 20% of time the flash will not flash ( the ready light is on Red)
4. 3% of the time one flash will fire and the other will not (it seems when this happens, the flash will fire after the shutter closes, with lower power)
tested again with my Cheap Yongnuo $35 radio trigger, Set both camera and flash to manual,
Camera 1/160 Low speed continuous, Flash 1/64
The Cheap yongnuo trigger never missed a shot, and Phottix Odin had 50% dark shots.