I don't have an answer to your question. I'd say give it a try. As long as you clean the iron of any grit before moving to a finer stone, you can't really hurt anything. I think green stropping compound is .4 micron. I go to an 8000x King waterstone. That seems to be just fine. Stropping would be a little bit better, but I don't see it as being any advantage. Jay might be referring to Japanese plane irons. They could be harder, and might benefit from a finer edge.
Thanks for renewing. Sometimes it comes at a tough time for me, but I find a way.
