I've never used them, but you may want to look into some line level attenuator cables. When I purchased my MBHO's I had to get attenuators (the switchable Shure ones) and it has definitely allowed for more room with my Ad20>D8.
I used to run the Sound Pro's version of the 853's, without the phantom power mod and on several occasions I had issues with the Ad20 pushing too much, even with the gain knobs all the way down.
And it seems to me that stealthing two cables could be more comfy than a couple 4 1/2" attenuators, and less of a chance of accidental level switching.