IMHO, three mistakes.
First, you are trying to use cold blue for a major reblue job. It simply does not work. Those who have used it like a rust blue, with boiling, carding, and more bluing, say it turns out reasonably well, but still is not as durable as a regular hot tank blue or a real rust blue.
Your second mistake, again IMO, was in using B-C blue. I have found it about worthless. I like G96 paste blue, but Brownell's Oxpho-Blue is excellent. 44-40 is, IMO, not as good as either of the others, but better than B-C.
Third, you didn't do any metal preparation. That is done automatically if you polish off the blue, but you used blue remover so you have to polish the surface shiny to allow the blue to take. You don't need a wheel; you can use fine grit (600 or higher) emery paper (available at auto stores) or the polishing tips of a Dremel tool. It depends on the appearance you want.
Jim