Peter, my impression is that the B&W images are B&W versions of your color images. As in, the color images were processed to reflect your normal tastes and that they were then converted into B&W.
My thought is that, for greatest success in B&W, you may need to start with the raw or base file and work the B&W image from there. With time and experimentation, you may come up with your own equally unique interpretation of B&W.
In other words, my thought is that you might want to divorce your B&W process from your color process and render them two separate and distinct processes. This could truly open up a new creative vision and expression in B&W.
- Murray
PS. By the way, this is a great thread. Thank you for having the courage to post it.