Applying a binder to chicken after wet marinating
This is a good tutorial: http://www.wikihow.com/Apply-Dry-Rub-to-Chicken

2 things from the above link: 


Properly dry the meat before applying the rub.
Let the meat rest a little while with the rub so that the rub re-hydrate a little bit and that will help it stick more to the meat.


So you will need to adjust your timing between getting the meat out of the wet marinade and putting it in the smoker.