If you are breeding to the breed standard I would get a Standard of Perfection and that way you can see what the standard calls for in a SLW... A good rose comb will look differant from breed to breed..
Wyandottes Comb Should Be...
Rose; low, firm on the head; top, free from hollow center, oval surface covered with smallround points; tapering to a well-defined point at the rear; the entire comb curving to conform to the shape of the skull...
If I was you I work on the work on the back, breast, condition and vigor, and body and fluff.. From what I seen a lot of Wyandottes have to flat of back and breast...
I would like to see a picture of what you have to work with..
Chris