The fuzzy cloud of reflective light, as you refer to it, unfortunately is a by-product of the LESS expensive opics &/or coatings. I see it in my Pentax PCF WP II 20x60, I saw it in my Nikon Action 16x50, & I see it in my Garrett Optical Gemini 20x80LW's, at certain light angles during the day.
I am sure all the manufacturers are aware of it & there is nothing they can do to eliminate it, in the lower priced binoculars.
As you already have noticed, there is less haze being produced by your 7x50's, so, greater magnification also contribues to this problem, in the less expensive binoculars.
I believe that it is also a lack of effective internal baffling, in some instances.
The old saying, You get what you pay for, still applies.
Tento20x60USSR+Orion12x63MiniGiant+Spectrum I 20x65
Orion15x70LittleGiant II+Orion20x70LittleGiant II+Orion16x80Giant