How are you making your B&W conversions? There are multiple methods, in different softwares, and not all are equal.
To be completely honest this particular set used an "action" in photoshop

which I tweaked quite a bit. I'll have to look to see what method it used BUT Ive been using Lightroom and adjusting contrast and luminance, Tone curves and playing with the channels.
Sooo photoshop and Lightroom. If anyone has a link to some awesome tutorials that would be great, or just more advice on how to master the black and white edit.