Hi Linda
I've been advocating wicks for raised-beds-on-legs where the bottom few inches get water-logged and stinky (anaerobic or hypoxic fermenation).
Vegetable Gardening: Table Top Gardens
http://davesgarden.com/communi...
But making the soil mix drain
adequately, as you're doing, is a better solution.
I'm still trying to get pine bark coarse enough that it doesn't provide excessive wicking all by itself! Now I start with better quality mulch, and "medium" rather then "fine". I wish I had some 3-per-inch hardware cloth instead of just 1/2" and 1/4"!
I use the 1/4" hardware cloth to try to discard as much of the fine stuff as practical, but it's slow work. Those fines are good for in-ground raised bed soil amnedment, but not so good for pots.
