Strobe Sweet Spot for EMWL

I just started shooting the EMWL (130 deg) with a Nikon D850.  So much fun, but I have 2 Inon Z330 strobes and wondered if there is a "sweet spot" for them to avoid backscatter especially when you have the lens up really close to a subject and there is water in the background.  

When using the EMWL for Wide Angle Macro I position the flashes as close to the lens barrel as possible, and have them on very low power (because they are so close). i have some nice video of me shooting it, which I'll try and share when I get home.

Remembered I had this photo (thanks Nir):

Alex

Thanks for the insight. I had a particularly bad day recently when there was a lot of sargassum in the water.   Some days too I notice stuff getting between the individual pieces causing blackish spots.  I'm looking into some rubber bands to prevent that.