+1 on the Charnley. It can be a really nice finishing stone. I usually go to mine after an 8K and use 10 NO PRESSURE X strokes on it. It actually hits first time on about 7 out of 10 razors. I like starting with 10 strokes on the finishers as it will build up a knowledge base of whether too much or too little that helps you gain consistency with that particular stone. You can always go up or down with 3-5 strokes and normally you will end up with a decent shave in just a few tries. On the hardest stones however, it can take a lot more strokes and fiddling.
I did try building a light slurry a couple times with the Charnley. What a mess!! My Charnley has a grainy feel to it to begin with and the slurry was just not needed and was a pain to get totally cleaned off with the oil on the stone.
Have fun.