I have a tip for everybody about suet.The starlings prefer the (commercial) suet but the woodpeckers very much prefer the suet in it's natural state-beef fat found in the meat department in you're grocery store.
The stuff you get in preshaped blocks really attracts those starlings(and boy can they leave a mess behind).
I have never seen the woodpeckers touch that stuff when there is plain old beef fat around.
I hope it helps to attract the woodpeckers to you're feeders because they are such a joy to watch.