RG 570 and EMG
I think the 81 is a bit empty sounding, especially since the body of an rg 570 is basswood. *I have an 89 lying around that I might install for the bridge position. *Man, if I do that, I'll have 2 humbuckers and 2 single coils!
I originally liked the 81 in the bridge because it had a harsh metal sound and high gain. *I grew out of this sound and now realize that the 81 doesn't work too well for other things. *It's TOO high end, which works really well at times, but not very versatile. *Plus, I hate the clean sound. *I might try your idea and place the 89 in the bridge. *By the way, how is your switch setup?