I did it! I got gray fabric!
It took 32 recipes but I eventually got a gray recipe that I like a lot. I dyed 8 steps to make sure it stays gray and I even dyed it twice to make sure the recipe could be repeated. The black isn't as dark as I wanted to I'm going to try to work on that.
My work is not done though. I did this recipe using my dye concentrates. Now I need to convert it to powder so I can mix my own black dyed powder by weight. I'm sure that's going to take a few weeks to work out but at least I've got a base to work with.