Rich idle, would this help?

I didn't mod mine I just read everything then opened my secondaries just a little like 1/8-1/4 turn to let a little air in and backed off the curb idle , it now idles much better the curb is only about 1/3 of a turn open , and the plugs look the same as they did after I wire brushed them , no carbon and now flecks or glazing just like in the pic in the LS link .