Copy the settings from the overexposed in M mode and Odin in m to, and set it to the lowest poweroutput, follow those steps back to the correct setting and see if you get the same result. If you do, the scene was just overlit and everything works.
I would HIGHLY recommend the method I use;
Camera to m and sync speed and desired aperture, if it's large start at iso 100. If the ambient is too high or too low adjust aperture and or iso. I like my backgrounds, usually, at least 1,5 stops under my key, normally my flashes.
When you have the background lit the way you want, fire up the Odin and set it to M also, simply dial up or down so your subject is lit the way you want.
If you want even less dof, use an ND filter.
If you use more than one flash turn them all off, turn one on and a adjust, turn it off again and adjust the next. Then if they mix to high in power you only need a very slight adjustment.