["I]I was wondering of the jump from 600 to 1500 was too much. I do that one the wood turning I do with out an issue but metal obviously is completely different."
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It depends on your 600 finish or even the lower grits. If you have an even finish 600 can easily be removed with 1k or 1.5k. What you see is below the finish. You also have to remove the previous grit scratches with each grit jump. Steel eats paper, much faster than wood. Change your paper often, the backer makes a Big difference, and change directions as I mentioned before.

The pitting I see, in the original photos is the same pitting I see in the finished blade. You did not go deep enough or spend enough time to get an even patter in the low grits.

Your issue is not the finish, it is the base.

I would go back to 400 and try to get an even pattern, keeping an eye on the deepest pits.

I would hit the magnetic with 1k and see, if you have to, drop to 600, 600 scratches come out easy with 1k paper. I often sand a razor with 1k then buff, it will remove a lot of surface imperfections and make a blade pop. 1k scratches can be buffed with metal polish by hand, but a bit of 2k makes it easier, and does not take that much time.

Sometimes, a satin finish is the way to go with problem razors, better yet buy better razors…

It is much easier and safer to sand an unpinned razor