Personally, I take chicken off at 160 in the breast and then tent it with HD foil for 10-30 minutes depending on eating time. It will continue to cook under the foil.
You could also try to ice the breast of the bird so that the white meat and the dark meat get to respective temps. I have never done it with chicken but it works wonderfully with turkey. For a turkey, 20 minutes, no more no less. So, if I had to guess on a 5 lb whole chicken, I'd say 5 minutes to start.
Pepperhead, Large BGE, Masterbuilt 7 in 1, Charmglow Gasser