Steve, are you running any of your e4200's as bridges?
I've now flashed to the recommended kingkong-nv60k-broadcom-22000M.bin, and all of the issues in my above post are the same. And for the heck of it, I did a 30-30-30 before flashing, after flashing. And then for good measure I flashed the same version again followed by a 30-30-30. wl1 on the bridge will not keep the selected channel. And every attempt to change it causes wl0 or wl1 to change. It's maddening.