I'd just add that first razors always seem to take longer than expected to hone. It is one of those weird things. Combine that with the fact it is INOX (which always takes me a little longer than straight carbon steel) and that your bevel setting stone is the 4K, I'd agree with the other guys that more time on that low grit is needed.

You'll get there, just keep a good technique and keep at it.

James.